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Office of Scientific and Technical Information
Wheel loader round up
Science Conference Proceedings (OSTI)
Operator comfort and serviceability remain important features of front-end loaders or wheel loaders. The article reports on features of the latest large loaders from three companies: Caterpillar (the 992G and 994F), Komatsu (the WA800-3, WA900-3 and WA1200-3), and Le Tourneau (the L-950, L-1350, L-1850 and L-2350). 1 tab., 4 photos.
Fiscor, S.
Spatially hybrid computations for streamer discharges with generic features of pulled fronts: I. Planar fronts
Streamers are the first stage of sparks and lightning; they grow due to a strongly enhanced electric field at their tips; this field is created by a thin curved space charge layer. These multiple scales are already challenging when the electrons are ... Keywords: 52.65.Kj, 52.80.Pi, Hybrid model, Large deviations, Pulled fronts, Streamer discharge
Chao Li; Ute Ebert; Willem Hundsdorfer
Superabrasive Wheel Applications
Table 5 Variables influencing grinding operations with superabrasives...Precision Dynamic stability Features Controls Power, speed, and so on Slide movements Truing and dressing equipment Coolant Type Pressure Flow Filtration systems Wheel selection Core material Wheel design Abrasive Type, properties Particle size Size distribution Content Bond Type Hardness/grade...
Examination of the Mesoscale Features of the GALE Coastal Front of 24-25 January 1986
The early evolution of a coastal front that formed off the southeast coast of the United States on 24 January 1986 is examined. Satellite and radar imagery together with the intensive surface, upper0air, and aircraft observations available during ...
Allen J. Riordan
VEHICLE SPECIFICATIONS Vehicle Features
NLE Websites -- All DOE Office Websites (Extended Search)
Mazda 3 Mazda 3 VIN: JMZBLA4G601111865 Seatbelt Positions: 5 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc Brakes Rear Disc Brakes Front Wheel Drive Anti-Lock Brakes Traction Control Air Bags AM/FM Stereo with CD Weights Design Curb Weight: 2,954 lb Delivered Curb Weight: 2,850 lb Distribution F/R (%): 63/37 GVWR: 4,050 lb GAWR F/R: 2,057/1,896 lb Payload 1 : 1,096 lb Performance Goal: 400 lb Dimensions Wheelbase: 103.9 in Track F/R: 60.4/59.8 in Length: 175.6 in Width: 69.1 in Height: 57.9 in Ground Clearance: 6.1 in Performance Goal: 5.0 in Tires Manufacturer: Yokohama Model: YK520 Size: P205/55R17 Pressure F/R: 35/33 psi
Ultrasonic search wheel probe
DOE Patents (OSTI)
A device is provided for reducing internal reflections from the tire of an ultrasonic search wheel probe or from within the material being examined. The device includes a liner with an anechoic chamber within which is an ultrasonic transducer. The liner is positioned within the wheel and includes an aperture through which the ultrasonic sound from the transducer is directed.
Mikesell, Charles R. (Idaho Falls, ID)
Automatic Mechetronic Wheel Light Device
A wheel lighting device for illuminating a wheel of a vehicle to increase safety and enhance aesthetics. The device produces the appearance of a "ring of light" on a vehicle's wheels as the vehicle moves. The "ring of light" can automatically change in color and/or brightness according to a vehicle's speed, acceleration, jerk, selection of transmission gears, and/or engine speed. The device provides auxiliary indicator lights by producing light in conjunction with a vehicle's turn signals, hazard lights, alarm systems, and etc. The device comprises a combination of mechanical and electronic components and can be placed on the outer or inner surface of a wheel or made integral to a wheel or wheel cover. The device can be configured for all vehicle types, and is electrically powered by a vehicle's electrical system and/or battery.
Khan, Mohammed John Fitzgerald (Silver Spring, MD)
SciTech Connect
Energy harvesting Wheel Speed Sensor.
E-Print Network (OSTI)
??This thesis presents a prototype energy harvesting autonomous sensor, called the Autonomous Wheel Speed Sensor (AWSS), that is targeted for operation in the Electronic Braking� (more)
Parthasarathy, Dhasarathy
Definition: Water Wheels | Open Energy Information
Open Energy Info (EERE)
Wheels Wheels Jump to: navigation, search Dictionary.png Water Wheels A water wheel is a large wheel that takes energy in free-flowing or falling water and converts it into a useful form of energy.[1] View on Wikipedia Wikipedia Definition A water wheel is a machine for converting the energy of free-flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a large wooden or metal wheel, with a number of blades or buckets arranged on the outside rim forming the driving surface. Most commonly, the wheel is mounted vertically on a horizontal axle, but the tub or Norse wheel is mounted horizontally on a vertical shaft. Vertical wheels can transmit power either through the axle or via a ring gear and typically drive belts or gears; horizontal wheels usually directly drive their load.
Wheels � on division by zero
We show how to extend any commutative ring (or semiring) so that division by any element, including 0, is, in a sense, possible. The resulting structure is called a wheel. Wheels are similar to rings, but $0x=0$ does not hold in general; the subset ...
Jesper Carlstr�m
Wheel-type magnetic refrigerator
The disclosure is directed to a wheel-type magnetic refrigerator capable of cooling over a large temperature range. Ferromagnetic or paramagnetic porous materials are layered circumferentially according to their Curie temperature. The innermost layer has the lowest Curie temperature and the outermost layer has the highest Curie temperature. The wheel is rotated through a magnetic field perpendicular to the axis of the wheel and parallel to its direction of rotation. A fluid is pumped through portions of the layers using inner and outer manifolds to achieve refrigeration of a thermal load.
Barclay, J.A.
Barclay, John A. (Los Alamos, NM)
The disclosure is directed to a wheel-type magnetic refrigerator capable of cooling over a large temperature range. Ferromagnetic or paramagnetic porous materials are layered circumferentially according to their Curie temperature. The innermost layer has the lowest Curie temperature and the outermost layer has the highest Curie temperature. The wheel is rotated through a magnetic field perpendicular to the axis of the wheel and parallel to its direction of rotation. A fluid is pumped through portions of the layers using inner and outer manifolds to achieve refrigeration of a thermal load. 7 figs.
Rim seal for turbine wheel
A turbine wheel assembly includes a disk having a plurality of blades therearound. A ceramic ring is mounted to the housing of the turbine wheel assembly. A labyrinth rim seal mounted on the disk cooperates with the ceramic ring to seal the hot gases acting on the blades from the disk. The ceramic ring permits a tighter clearance between the labyrinth rim seal and the ceramic ring.
Glezer, Boris (Del Mar, CA); Boyd, Gary L. (Alpine, CA); Norton, Paul F. (San Diego, CA)
VEHICLE SPECIFICATIONS Vehicle Features Base Vehicle: 2010 Honda
Honda Honda Civic Hybrid VIN: JHMFA3F24AS005577 Seatbelt Positions: 5 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc Brakes Rear Disc Brakes Front Wheel Drive Regenerative Braking Anti-Lock Brakes Traction Control Air Bags AM/FM Stereo with CD State of Charge Meter 1 Weights Design Curb Weight: 2877 lb Delivered Curb Weight: 2982 lb Distribution F/R (%): 57/43 GVWR: 3792 lb GAWR F/R: 1973/1841 lb Payload 2 : 810 lb Performance Goal: 400 lb Dimensions Wheelbase: 106.3 in Track F/R: 59.1/60.2 in Length: 177.3 in Width: 69.0 in Height: 56.3 in Ground Clearance: 6.0 in Performance Goal: 5.0 in Tires Manufacturer: Bridgestone
VEHICLE SPECIFICATIONS Vehicle Features Base Vehicle: 2010 Smart
Smart Smart Fortwo MHD VIN: WME4513341K406476 Seatbelt Positions: 2 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc Brakes Rear Drum Brakes Rear Wheel Drive Anti-Lock Brakes Traction Control Air Bags AM/FM Stereo with CD player Weights Design Curb Weight:1,818 lb Delivered Curb Weight: 1.742 lb Distribution F/R (%):44/56 GVWR: 2,244 lb GAWR F/R: 968/1,452 lb Payload 1 : 426 lb Performance Goal: 400 lb Dimensions Wheelbase: 73.5 in Track F/R: 50.5/54.5 in Length: 106.1 in Width: 61.4 in Height: 60.7 in Ground Clearance: 6.25 in Performance Goal: 5.0 in Tires Manufacturer: Continental Model: ContiproContact Size: Front -P155/60/R15
Cold Fronts in CDM clusters
Recently, high-resolution Chandra observations revealed the existence of very sharp features in the X-ray surface brightness and temperature maps of several clusters (Vikhlinin et. al., 2001). These features, called ``cold fronts'', are characterized by an increase in surface brightness by a factor >2 over 10-50 kpc, accompanied by a drop in temperature of a similar magnitude. The existence of such sharp gradients can be used to put interesting constraints on the physics of the intracluster medium (ICM), if their mechanism and longevity are well understood. Here, we present results of a search for cold fronts in high-resolution simulations of galaxy clusters in cold dark matter (CDM) models. We show that sharp gradients with properties similar to those of observed cold fronts naturally arise in cluster mergers when the shocks heat gas surrounding the merging sub-cluster, while its dense core remains relatively cold. The compression induced by supersonic motions and shock heating during the merger enhance the amplitude of gas density and temperature gradients across the front. Our results indicate that cold fronts are non-equilibrium transient phenomena and can be observed for a period of less than a billion years. We show that the velocity and density fields of gas surrounding the cold front can be very irregular which would complicate analyses aiming to put constraints on the physical conditions of the intracluster medium in the vicinity of the front.
Daisuke Nagai; Andrey V. Kravtsov
Development of legged, wheeled, and hybrid rover mobility models to facilitate planetary surface exploration mission analysis
This work discusses the Mars Surface Exploration (MSE) tool and its adaptation to model rovers featuring legged, wheeled, and hybrid mobility. MSE is a MATLAB based systems engineering tool that is capable of rapidly ...
McCloskey, Scott H. (Scott Haddon)
The Formation of New England Coastal Fronts
Coastal fronts are a frequent late fall and early winter feature of eastern New England weather. Data from a mesoscale observing network is used to describe the process of coastal frontogenesis and to determine the causes of formation. Three ...
John W. Nielsen
Hydrogen Embrittlement of a Bainitic Wheel Steel
Presentation Title, Hydrogen Embrittlement of a Bainitic Wheel Steel ... (SSRT) test and hydrogen-induced delayed cracking (HIDC) were investigated in a noval �...
Project considerations and design of systems for wheeling cogenerated power
Wheeling electric power, the transmission of electricity not owned by an electric utility over its transmission lines, is a term not generally recognized outside the electric utility industry. Investigation of the term`s origin is intriguing. For centuries, wheel has been used to describe an entire machine, not just individual wheels within a machine. Thus we have waterwheel, spinning wheel, potter`s wheel and, for an automobile, wheels. Wheel as a verb connotes transmission or modification of forces and motion in machinery. With the advent of an understanding of electricity, use of the word wheel was extended to be transmission of electric power as well as mechanical power. Today, use of the term wheeling electric power is restricted to utility transmission of power that it doesn`t own. Cogeneration refers to simultaneous production of electric and thermal power from an energy source. This is more efficient than separate production of electricity and thermal power and, in many instances, less expensive.
Tessmer, R.G. Jr.; Boyle, J.R.; Fish, J.H. III; Martin, W.A.
In-line drivetrain and four wheel drive work machine using same
A four wheel drive articulated mine loader is powered by a fuel cell and propelled by a single electric motor. The drivetrain has the first axle, second axle, and motor arranged in series on the work machine chassis. Torque is carried from the electric motor to the back differential via a pinion meshed with the ring gear of the back differential. A second pinion oriented in an opposite direction away from the ring gear is coupled to a drive shaft to transfer torque from the ring gear to the differential of the front axle. Thus, the ring gear of the back differential acts both to receive torque from the motor and to transfer torque to the forward axle. The in-line drive configuration includes a single electric motor and a single reduction gear to power the four wheel drive mine loader.
Hoff, Brian (East Peoria, IL)
Wheeling Power Co | Open Energy Information
Wheeling Power Co Wheeling Power Co Place Ohio Service Territory West Virginia Website www.aepohio.com Green Button Reference Page www.aep.com/newsroom/news Green Button Committed Yes Utility Id 20521 Utility Location Yes Ownership I NERC Location RFC NERC RFC Yes RTO PJM Yes Activity Transmission Yes Activity Distribution Yes Alt Fuel Vehicle Yes Alt Fuel Vehicle2 Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] Energy Information Administration Form 826[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png No rate schedules available. Average Rates No Rates Available The following table contains monthly sales and revenue data for Wheeling
Microsoft Word - toyrav98.html
Seatbelt Positions: Five Standard Features: AMFM Stereo Radio Tilt Steering Wheel Air Conditioning (Gas Injection Heat Pump) Heater (Gas Injection Heat Pump) Front Wheel...
Clean Cities: Waste-to-Wheels: Building for Success Workshop
Events Events Printable Version Share this resource Send a link to Clean Cities: Waste-to-Wheels: Building for Success Workshop to someone by E-mail Share Clean Cities: Waste-to-Wheels: Building for Success Workshop on Facebook Tweet about Clean Cities: Waste-to-Wheels: Building for Success Workshop on Twitter Bookmark Clean Cities: Waste-to-Wheels: Building for Success Workshop on Google Bookmark Clean Cities: Waste-to-Wheels: Building for Success Workshop on Delicious Rank Clean Cities: Waste-to-Wheels: Building for Success Workshop on Digg Find More places to share Clean Cities: Waste-to-Wheels: Building for Success Workshop on AddThis.com... Conferences & Workshops Clean Cities 20th Anniversary Electric Vehicle Community Readiness Stakeholder Summit Waste-to-Wheels
DOE Hydrogen Analysis Repository: Well-to-Wheels Analysis of...
Well-to-Wheels Analysis of Hydrogen Fuel-Cell Vehicle Pathways in Shanghai Project Summary Full Title: Well-to-Wheels Analysis of Hydrogen Based Fuel-Cell Vehicle Pathways in...
Observations of Near-Inertial Waves in a Front
Near-inertial with horizontal scales O(10 km) dominate profiles of velocity finestructure collected in the North Pacific Subtropical Front during January 1980. Considerable spatial variability is observed. Two features in particular contain most ...
Eric Kunze; Thomas B. Sanford
A computational study of tandem dual wheel aerodynamics and the effect of fenders and fairings on spray dispersion
With the goal of understanding how to mitigate the safety hazard of splash and spray around heavy vehicles, a computational study of the aerodynamics and spray dispersion about a simplified trailer wheel assembly has been completed. A tandem dual slick (TDS) wheel model that neglects complex geometric features such as brakes, wheel bolts and wheel cutouts but with the same dimensions as an actual trailer wheel assembly was used . A detailed simulation of the wheels alone demonstrated that the flow field is both unsteady and complex, containing a number of vortical structures that interact strongly with spray. Preliminary simulations with fenders and fairings demonstrated that these devices prevent the ballistic transport of drops larger than approximately 0.1 mm, but the fine mist speculated to be responsible for visibility reduction is unaffected. This work suggests that to use computational fluid dynamics (CFD) to design and evaluate spray mitigation strategies the jet or sheet breakup processes can be modeled using an array of injectors of small (< 0.01 mm) water droplets; however the choice of size distribution, injection locations, directions and velocities is largely unknown and requires further study. Possible containment strategies would include using flow structures to 'focus' particles into regions away from passing cars or surface treatments to capture small drops.
Paschkewitz, J S
NETL: NewsRoom - Feature Stories
Feature Stories September 2013 NETL's Supercomputer Addresses Energy Issues on Two Fronts August 2013 Adapting Energy Research for Further Innovations: A Little Sharing Among...
QCD and Light-Front Dynamics
AdS/QCD, the correspondence between theories in a dilaton-modified five-dimensional anti-de Sitter space and confining field theories in physical space-time, provides a remarkable semiclassical model for hadron physics. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time. The result is a single-variable light-front Schroedinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The coordinate z in AdS space is uniquely identified with a Lorentz-invariant coordinate {zeta} which measures the separation of the constituents within a hadron at equal light-front time and determines the off-shell dynamics of the bound state wavefunctions as a function of the invariant mass of the constituents. The hadron eigenstates generally have components with different orbital angular momentum; e.g., the proton eigenstate in AdS/QCD with massless quarks has L = 0 and L = 1 light-front Fock components with equal probability. Higher Fock states with extra quark-anti quark pairs also arise. The soft-wall model also predicts the form of the nonperturbative effective coupling and its {beta}-function. The AdS/QCD model can be systematically improved by using its complete orthonormal solutions to diagonalize the full QCD light-front Hamiltonian or by applying the Lippmann-Schwinger method to systematically include QCD interaction terms. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined.
Brodsky, Stanley J.; de Teramond, Guy F.; /SLAC /Southern Denmark U., CP3-Origins /Costa Rica U.
Intensification of Ocean Fronts by Down-Front Winds
Many ocean fronts experience strong local atmospheric forcing by down-front winds, that is, winds blowing in the direction of the frontal jet. An analytic theory and nonhydrostatic numerical simulations are used to demonstrate the mechanism by ...
Leif N. Thomas; Craig M. Lee
Wheeling, Illinois: Energy Resources | Open Energy Information
Wheeling, Illinois: Energy Resources Wheeling, Illinois: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 42.1391927°, -87.9289591° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.1391927,"lon":-87.9289591,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
A magneto-electric quantum wheel
Here we show that self-propulsion in quantum vacuum may be achieved by rotating or aggregating magneto-electric nano-particles. The back-action follows from changes in momentum of electro-magnetic zero-point fluctuations, generated in magneto-electric materials. This effect may provide new tools for investigation of the quantum nature of our world. It might also serve in the future as a "quantum wheel" to correct satellite orientation in space.
Alexander Feigel
The German Front Experiment 1987
The German Front Experiment, 1987 (GFE87) is a field experiment using aircraft, radar, surface, and upper-air observations to determine the influence of the European Alps on cold fronts. Measurements are concentrated in the Rhine Valley and in ...
Klaus P. Hoinka; Hans Volkert
Free-wheeling hydraulic power mills
DOE Green Energy (OSTI)
Free-wheeling power plants using free replenishable hydraulic forces of winds and water currents would consist of most or all of the following: fore and after cones to increase throughput; duplex impellers; rotors with dc/ac excitation, ac/dc inverters and dc field coils; stators with ac output of varying frequency, voltage and power; solid-state ac/dc inverters, dc electrolytic cell banks for GH/sub 2/ and GO/sub 2/ production; and neon refrigerators for reducing these to LOX and chilled GH/sub 2/ for ease in shipment or storage.
Hall, F.F.
Microsoft Word - ffort-09.html
VIN: 2CIMR5299567000106 Seating Capacity: 4 Adults Features: AMFM Radio, Heater, Battery Thermal Management, Power Steering, Power Brakes, Front Wheel Drive, Front Disc...
Light-Front Holographic QCD
The relation between the hadronic short-distance constituent quark and gluon particle limit and the long-range confining domain is yet one of the most challenging aspects of particle physics due to the strong coupling nature of Quantum Chromodynamics, the fundamental theory of the strong interactions. The central question is how one can compute hadronic properties from first principles; i.e., directly from the QCD Lagrangian. The most successful theoretical approach thus far has been to quantize QCD on discrete lattices in Euclidean space-time. Lattice numerical results follow from computation of frame-dependent moments of distributions in Euclidean space and dynamical observables in Minkowski spacetime, such as the time-like hadronic form factors, are not amenable to Euclidean lattice computations. The Dyson-Schwinger methods have led to many important insights, such as the infrared fixed point behavior of the strong coupling constant, but in practice, the analyses are limited to ladder approximation in Landau gauge. Baryon spectroscopy and the excitation dynamics of nucleon resonances encoded in the nucleon transition form factors can provide fundamental insight into the strong-coupling dynamics of QCD. New theoretical tools are thus of primary interest for the interpretation of the results expected at the new mass scale and kinematic regions accessible to the JLab 12 GeV Upgrade Project. The AdS/CFT correspondence between gravity or string theory on a higher-dimensional anti-de Sitter (AdS) space and conformal field theories in physical space-time has led to a semiclassical approximation for strongly-coupled QCD, which provides physical insights into its nonperturbative dynamics. The correspondence is holographic in the sense that it determines a duality between theories in different number of space-time dimensions. This geometric approach leads in fact to a simple analytical and phenomenologically compelling nonperturbative approximation to the full light-front QCD Hamiltonian 'Light-Front Holography'. Light-Front Holography is in fact one of the most remarkable features of the AdS/CFT correspondence. The Hamiltonian equation of motion in the light-front (LF) is frame independent and has a structure similar to eigenmode equations in AdS space. This makes a direct connection of QCD with AdS/CFT methods possible. Remarkably, the AdS equations correspond to the kinetic energy terms of the partons inside a hadron, whereas the interaction terms build confinement and correspond to the truncation of AdS space in an effective dual gravity approximation. One can also study the gauge/gravity duality starting from the bound-state structure of hadrons in QCD quantized in the light-front. The LF Lorentz-invariant Hamiltonian equation for the relativistic bound-state system is P{sub {mu}}P{sup {mu}}|{psi}(P)> = (P{sup +}P{sup -} - P{sub {perpendicular}}{sup 2})|{psi}(P)> = M{sup 2}|{psi}(P)>, P{sup {+-}} = P{sup 0} {+-} P{sup 3}, where the LF time evolution operator P{sup -} is determined canonically from the QCD Lagrangian. To a first semiclassical approximation, where quantum loops and quark masses are not included, this leads to a LF Hamiltonian equation which describes the bound-state dynamics of light hadrons in terms of an invariant impact variable {zeta} which measures the separation of the partons within the hadron at equal light-front time {tau} = x{sup 0} + x{sup 3}. This allows us to identify the holographic variable z in AdS space with an impact variable {zeta}. The resulting Lorentz-invariant Schroedinger equation for general spin incorporates color confinement and is systematically improvable. Light-front holographic methods were originally introduced by matching the electromagnetic current matrix elements in AdS space with the corresponding expression using LF theory in physical space time. It was also shown that one obtains identical holographic mapping using the matrix elements of the energy-momentum tensor by perturbing the AdS metric around its static solution. A gravity dual to QCD is not known, but th
Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; de Teramond, Guy F.; /Costa Rica U.
The U.S. Army's Vehicle Intelligence Program (AVIP): The Future of Manned, Wheeled Tactical Vehicles
Vehicle The U.S. Army's Vehicle Vehicle The U.S. Army's Vehicle Intelligence Program (AVIP): Intelligence Program (AVIP): The Future of Manned, Wheeled The Future of Manned, Wheeled Tactical Vehicles Tactical Vehicles H. E. (Bill) Knéé Oak Ridge National Laboratory National Transportation Research Center 2360 Cherahala Blvd. Knoxville, Tennessee 37932 USA Phone: (865) 946-1300 Fax: (865) 946-1314 E-mail: email@example.com David J. Gorsich U.S. Army Tank-Automotive and Armaments Command AMSTA-TR-N, Warren, Michigan 49397-5000 USA Phone: (810) 574-7413 Fax: (810) 574-6996 E-mail: firstname.lastname@example.com IV2001 IEEE Intelligent Vehicles Symposium Tokyo, Japan http://www.ornl.gov/ORNLReview/v33_3_00/features.htm 1. Propulsion, Vehicle and Power Systems 2. Information and Decision Support Systems 3. Materials, Structures, and Mechanical Systems
The design process for wheel-robot integration
In this thesis, the design process for wheel-robot integration was documented and reflected on. The project focused on redesigned certain aspects a half-scale wheel-robot to be integrated with a half-scale CityCar prototype ...
Carvajal, Michael Angelo
Renewable energy is focus of New Science on Wheels programs offered...
Science On Wheels Renewable energy is focus of New Science on Wheels programs offered by Bradbury Science Museum The classes are designed to generate interest in science and...
Meso- and Microscale Features of a Colorado Cold Front
Data from the NOAA BAO (Boulder Atmospheric Observatory) tower and the PROFS (Program for Regional Observing and Forecasting Services) surface mesonetwork have been used to detect the meso- and microscale flow patterns associated with the passage ...
George S. Young; Richard H. Johnson
A positron source component is needed for the International Linear Collider Project. The leading design concept for this source is a rotating titanium alloy wheel whose spokes rotate through an intense localized magnetic field. The system is composed of an electric motor, flexible motor/drive-shaft coupling, stainless steel drive-shaft, two Plumber's Block tapered roller bearings, a titanium alloy target wheel, and electromagnet. Surrounding the target wheel and magnet is a steel frame with steel guarding plates intended to contain shrapnel in case of catastrophic wheel failure. Figure 1 is a layout of this system (guard plates not shown for clarity). This report documents the FEA analyses that were performed at LLNL to help determine, on a preliminary basis, the required guard plate thickness for three potential plate steels.
Hagler, L
Pulverizer Maintenance Guide, Volume 2: Babcock & Wilcox Roll Wheel Pulverizers
The "Pulverizer Maintenance Guide, Volume 2: B&W Roll Wheel� Pulverizers" provides fossil plant personnel with current maintenance information on this specific mill design. This guide will assist a plant in improving the maintenance of their pulverizer mills.
The Low-Level Structure and Evolution of a Dry Arctic Front over the Central United States. Part II: Comparison with Theory
This investigation examines the meso- and microscale aspects of the 9 March 1992 cold front that passed through Kansas during the daylight hours. The principal feature of this front is the relatively rapid frontogenesis that occurred. The total ...
William Blumen; Nimal Gamage; Robert L. Grossman; Margaret A. LeMone; L. Jay Miller
Upper-Level Frontogenesis: Two Case Studies from the FRONTS 87 Experiment
This study describes the structure of two cold fronts observed during the European experiment FRONTS 87. The selection of these two particular cases is based on the existence of well-marked upper-level features, such as strong jet streams, upper-...
Konstantinos Lagouvardos; Vassiliki Kotroni
The Sea-Breeze Front Analytical Model
Analytical solutions to the nonlinear equations of motion are used to describe the sea breeze front.
Yizhak Feliks
A Climatological Perspective of Transient Synoptic Features during NAME 2004
This note provides a first look at a recently developed long-term climatology of transient synoptic features in northern Mexico. Key features investigated include inverted troughs, cutoff lows, cold fronts, and open troughs (westerly short waves)...
Arthur V. Douglas; Phillip J. Englehart
A New Statistical Modeling Approach to Ocean Front Detection from SST Satellite Images
Ocean fronts are narrow zones of intense dynamic activity that play an important role in global ocean�atmosphere interactions. Owing to their highly variable nature, both in space and time, they are notoriously difficult features to adequately ...
Jo Hopkins; Peter Challenor; Andrew G. P. Shaw
Comparative Analysis of Low-Level Cold Fronts: Wavelet, Fourier, and Empirical Orthogonal Function Decompositions
Atmospheric cold fronts observed in the boundary layer represent relatively sharp transition zones between air masses of disparate physical characteristics. Further, wavelike features and/or eddy structures are often observed in conjunction with ...
Nimal Gamage; William Blumen
Variability of the Intertropical Front (ITF) and Rainfall over the West African Sudan�Sahel Zone
The Intertropical Front (ITF) is a fundamental feature of the atmospheric circulation over West Africa. It separates the wedge of warm moist southwesterly monsoon flow off the tropical Atlantic from much hotter and very dry northeasterly wind ...
M. Issa L�l�; Peter J. Lamb
Observations of the Tasman Front
Ship and air surveys were conducted in 1978�79 to examine the thermal structure in and near the Tasman Front between Australia and New Zealand at latitudes between Brisbane and Bass Strait. After separation from the continental slope, the East ...
John C. Andrews; Martin W. Lawrence; Carl S. Nilsson
Retooling Michigan: 'Wheels' to Wind | Department of Energy
Energy.gov (U.S. Department of Energy (DOE)) Indexed Site
Retooling Michigan: 'Wheels' to Wind Retooling Michigan: 'Wheels' to Wind Retooling Michigan: 'Wheels' to Wind July 21, 2010 - 10:12am Addthis This part from the inside of a wind turbine might someday generate clean, renewable energy. | Photo courtesy Merrill Technologies Group This part from the inside of a wind turbine might someday generate clean, renewable energy. | Photo courtesy Merrill Technologies Group Joshua DeLung "Traditionally, we made automotive products," says Scott McKay, General Manager for Merrill Technologies Group in Saginaw, Mich. "After several ups and downs in that industry, we've opened our eyes to finding ways to diversify our line of products, and one of those areas is in making renewable energy materials." Merrill is using $3 million awarded through the U.S. Department of
Light-Front Quantization and QCD Phenomena
The light-front quantization of QCD provides an alternative to lattice gauge theory for computing the mass spectrum, scattering amplitudes, and other physical properties of hadrons directly in Minkowski space. Nonperturbative light-front methods for solving gauge theory and obtaining light-front wavefunctions, such as discretized light-front quantization, the transverse lattice, and light-front resolvents are reviewed. The resulting light-front wavefunctions give a frame-independent interpolation between hadrons and their quark and gluon degrees of freedom, including an exact representation of spacelike form factors, transition form factors such as $B \\to \\ell \\bar \
S. J. Brodsky
Search on Modeling and Collaborative Simulation for Electric Drive Wheeled Armored Vehicle
In order to evaluate the performance of electric transmission wheeled armored vehicle, models of motor driving system and dynamics of the 8 wheels drive vehicles based on ADAMS/Car were constructed, which compose the model of collaborative simulation ... Keywords: ADAMS/Car, Matlab, electric transmission, wheeled armored vehicle, collaborative simulation, dynamic performance
Zili Liao, Guibing Yang, Chunguang Liu, Yu Xiang
Kelvin Fronts on the Equatorial Thermocline
Properties of internal wave fronts or Kelvin fronts travelling eastward in the equatorial waveguide are studied, motivated by recent studies on coastal Kelvin waves and jumps and new data on equatorial Kelvin waves. It has been recognized for ...
Alexey V. Fedorov; W. Kendall Melville
PV Frontogenesis and Upper-Tropospheric Fronts
Upper-tropospheric fronts and frontogenesis are viewed from a potental vorticity (PV) perspective. The rudiments of this approach are to regard such a front as a zone of strong PV gradient on isentropic surfaces, and to treat the accompanying ...
H. C. Davies; A. M. Rossa
Turbulent Mixing at the Pacific Subtropical Front
Some advection of water across the North Pacific subtropical front occurs by the subduction of surface mixed layers from the north side of the front underneath surface waters on the south side. Cross-frontal advection in the thermocline is ...
Rolf G. Lueck
Carbon Carbon Carbon Sequestration Sequestration State of the Science roadmapping future carbon sequestration R&D February 1999 A working paper for U.S. Department of Energy Office of Science Office of Fossil Energy i Carbon Sequestration DRAFT (February 1999) Dave Reichle, ORNL John Houghton, DOE Sally Benson, LBNL John Clarke, PNNL Roger Dahlman, DOE George Hendrey, BNL Howard Herzog, MIT Jennie Hunter-Cevera, LBNL Gary Jacobs, ORNL Rod Judkins, ORNL WORKING PAPER ON CARBON SEQUESTRATION SCIENCE AND TECHNOLOGY Office of Science Office of Fossil Energy U.S. Department of Energy Bob Kane, DOE Jim Ekmann, FETC Joan Ogden, Princeton Anna Palmisano, DOE Robert Socolow, Princeton John Stringer, EPRI Terry Surles, LLNL Alan Wolsky, ANL Nicholas Woodward, DOE Michael York, DOE ii DRAFT (February 1999) Carbon Sequestration
Electric Power Controller for Steering Wheel Management in Electric Cars
Electric Power Controller for Steering Wheel Management in Electric Cars Vicente Milanés, Joshué. An electric car has been equipped with the system designed and tests to prove the behavior of the system transportation systems. Among these topics, the automation of the actuators involved in the management of a car
Paris-Sud XI, Université de
Bucket wheel reclaimer modeling as a robotic arm
Bucket Wheeel Reclaimer (BWR) has been widely used for stacking/reclaiming bulk materials (i.e. iron ore) onto/from stockpiles in mining industry. Generally speaking, current BWRs are manually operated, remotely operated, or automated to simply follow ... Keywords: bucket wheel reclaimer, control, and fuzzy logic, modeling and simulation
Tien-Fu Lu
Fabrication of Aluminum Alloy-Based Diamond Grinding Wheel by ...
Moreover, ability of CFRP drilling of the aluminum alloy-based diamond grinding wheel ... Accelerated Post-Weld Natural Ageing in Ultrasonic Welding Aluminium ..... Powder Metallurgy of High Strength Al84Gd6Ni7Co3 Gas-atomized Powder.
BLM Sierra Front Field Office | Open Energy Information
Sierra Front Field Office Jump to: navigation, search Name BLM Sierra Front Field Office Short Name Sierra Front Parent Organization BLM Carson City District Office Address 5665...
Applications of AdS/QCD and Light-Front Holography to Baryon Physics
The correspondence between theories in anti-de Sitter space and field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD which has scale invariance at short distances and color confinement at large distances. These equations, for both mesons and baryons, give a very good representation of the observed hadronic spectrum, including a zero mass pion. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The meson and baryon wavefunctions derived from light-front holography and AdS/QCD also have remarkable phenomenological features, including predictions for the electromagnetic form factors and decay constants. The approach can be systematically improved using light-front Hamiltonian methods. Some novel features of QCD for baryon physics are also discussed.
Brodsky, Stanley J.; /SLAC; de Teramond, Guy F.; /Costa Rica U.
Numerical Analysis of the Channel Wheel Fresh Air Ventilator Under Frosting Conditions
As new equipment, the channel wheel fresh air ventilator has become increasingly popular in recent years. However, when such equipment is operated under low ambient temperature in the freezing area in winter, the formation of frost on the outdoor waste air surface becomes problematic, leading to the degradation of the channel wheel fresh air ventilator's performance or even the shutdown of equipment. Therefore, it is necessary to have a detailed investigation on the operational characteristics of the channel wheel fresh air ventilator under frosting in order to guide its application. This paper first reports on the development of a detailed model for the channel wheel heat exchanger, which is the core part of the channel wheel fresh air ventilator under frosting conditions. The model developed, first seen in open literature, consists of a frosting sub-model and a channel wheel heat exchanger sub-model. This is followed by reporting an evaluation of the operational characteristics of a frosted channel wheel heat exchanger under different ambient conditions using the model developed. These include frost formation on the surface of the channel wheel heat exchanger, and impacts on the operational performance of the channel wheel fresh air ventilator. Furthermore, the interval of defrosting is obtained, which provides the basis for the adoption of effective defrosting measures, and thus increasing the channel wheel fresh air ventilator's energy efficiency and operating reliability.
Gao, B.; Dong, Z.; Cheng, Z.; Luo, E.
Short-circuit simulations help quantify wheeling flow
During the late 1960s, three nuclear power plants were constructed in New England: Connecticut Yankee (590 MW, located in Haddam, Connecticut), Maine Yankee (870 MW located in Wiscasset, Maine), and Vermont Yankee (520 MW, located in Vernon, Vermont). Up to thirty-three New England utilities and municipalities participate in each. These units, called the Yankee units, are connected to the New England 345 kV transmission system. Built before the conception of the New England Power Pool (NEPOOL), these units rely on negotiated transmission agreements to implement the purchased power contracts. The Yankee Transmission Agreements were established to provide a mechanism for New England utilities, which provide the transmission wheeling services, to be adequately compensated for delivering the Yankee power. Under the agreements, the purchasing utilities (those utilities who purchase power from the nuclear plants) would pay into separate transmission funds based on their entitlement in the unit. The fund is then distributed among the transmitting utilities (those utilities providing the transmission wheeling services) based on the calculated use of their transmission systems. A methodology was established that could equal the units` life, offer flexibility to a changing system, and provide equitable results. This article describes how using commercially available software to automate simulations, perform the MW-miles calculation, and tabulate the results significantly reduces the time and computational effort to perform the wheeling calculations.
Scarfone, A.
Featured Scientist
Ed Home (text) - TRC Home - sciencelines Index Featured Scientist - Leo Bellatoni A growing number of teachers who have participated in the Phriendly Physics program have...
Microsoft Word - toyrav96.html
1996 Toyota RAV4 VIN:327T0220000000000 Seatbelt Positions: Four Standard Features: Air Conditioning (Heat Pump) Heating (Heat Pump) Front Wheel Drive Power Steering Power...
Front Vehicle Setup Information Downloadable Dynamometer Database...
Chevrolet Volt- 20F Test cell location Front Vehicle Setup Information Downloadable Dynamometer Database (D 3 )- Test Summary Sheet Vehicle architecture EREV Vehicle dynamometer...
VEHICLE SPECIFICATIONS Vehicle Features Base Vehicle: 2011 Hyundai
1 Hyundai Sonata VIN: KMEHC4A43BA004932 Seatbelt Positions: 5 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc...
Analysis of various designs of a desiccant wheel for improving the performance using a mathematical model
A mathematical model for predicting the performance of a desiccant wheel with various wheel designs has been used by considering heat and mass transfer for both moist air and the desiccant material. The model shows good agreement with experimental data. An experimental setup was fabricated using an evacuated tube solar air collector with a desiccant wheel. The hot air needed for regeneration is produced by the evacuated tube solar air collector
Avadhesh Yadav; V. K. Bajpai
Design and analysis of wheel hub to provide in-hub electric motor for HMMWV vehicle.
??This thesis describes the design of the wheel hub of hybrid HMMWV so as to introduce an electric in-hub motor inside the hub. Chapter I� (more)
Thakur, Sandeep Singh
Position and force control of a vehicle with two or more steerable drive wheels
When a vehicle with two or more steerable drive wheels is traveling in a circle, the motion of the wheels is constrained. The wheel translational velocity divided by the radius to the center of rotation must be the same for all wheels. When the drive wheels are controlled independently using position control, the motion of the wheels may violate the constraints and the wheels may slip. Consequently, substantial errors can occur in the orientation of the vehicle. A vehicle with N drive wheels has (N - 1) constraints and one degree of freedom. We have developed a new approach to the control of a vehicle with N steerable drive wheels. The novel aspect of our approach is the use of force control. To control the vehicle, we have one degree of freedom for the position on the circle and (N - 1) forces that can be used to reduce errors. Recently, Kankaanranta and Koivo developed a control architecture that allows the force and position degrees of freedom to be decoupled. In the work of Kankaanranta and Koivo the force is an exogenous input. We have made the force endogenous by defining the force in terms of the errors in satisfying the rigid body kinematic constraints. We have applied the control architecture to the HERMIES-III robot and have measured a dramatic reduction in error (more than a factor of 20) compared to motions without force control.
Reister, D.B.; Unseren, M.A.
Intrusion Characteristics in the Antarctic Polar Front
Data obtained on two cruises to the Antarctic Polar Front are used to investigate the nature of thermohaline intrusions in the front. These data, obtained in the Drake Passage and south of New Zealand, include CTD time series made relative to ...
John M. Toole
The light-front vacuum and dynamics
I give a quantum theoretical description of kinematically invariant vacuua on the algebra of free fields restricted to a light front and discuss the relation between the light-front Hamiltonian, P-, the vacuum, and Poincare invariance. This provides a quantum theoretical description of zero modes.
W. N. Polyzou
Cold Front Acceleration over Lake Michigan
High-resolution Eta Model simulations of a strong but relatively dry late winter surface cold front that occurred during the STORM-FEST project depicted a pronounced acceleration of the front during the afternoon hours over the southern end of ...
William A. Gallus Jr.; Moti Segal
Solar-MEC development program. Project 9103 third quarter progress report, March 1--May 31, 1978. [Desiccant wheel and regenerative heat exchange wheel performance
During the third quarter of the Solar-MEC program, work continued on developing the computer model simulating the desiccant wheel behavior (Task 1) and assessing the performance of the regenerative heat exchange wheel (Task 3). This report specifically presents the results obtained using the computer model as an analytical tool to evaluate design and operating conditions to optimize the wheel's performance. It also contains evaluations of two different available heat transfer matrixes: the currently used aluminum honeycomb and a new product, a potentially less-expensive, corrugated aluminum material. The mathematical modeling and diagnostic evaluations and ways of improving the component and machine performance were identified and are described for both tasks.
Wurm, J.; Weil, S.A.; Zawacki, T.S.; Kinast, J.A.; Macriss, R.A.
Light-Front Holography, AdS/QCD, and Hadronic Phenomena
AdS/QCD, the correspondence between theories in a modified five-dimensional anti-de Sitter space and confining field theories in physical space-time, provides a remarkable semiclassical model for hadron physics. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. We identify the AdS coordinate $z$ with an invariant light-front coordinate $\\zeta$ which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schr\\"odinger equation with a confining potential which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The mapping of electromagnetic and gravitational form factors in AdS space to their corresponding expressions in light-front theory confirms this correspondence. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. The distinction between static structure functions, such as the probability distributions computed from the square of the light-front wavefunctions, versus dynamical structure functions which include the effects of rescattering, is emphasized. A new method for computing the hadronization of quark and gluon jets at the amplitude level, an event amplitude generator, is outlined.
Stanley J. Brodsky; Guy F. de Teramond
Aspects of the History of the Prayer Wheel
on the roofs of motor-vans and refrigerated railway wagons are the lineal descendants of these. Horizontal water wheels ware also applied to rotate prayer cylinders in Tibet while water power had never been applied to revolving book cases in China. (Joseph... Industrie, Berlin, 1933, vol. 22, p. 99. 17. Arturo Uccelli, Storia della tecnica. Milan, 1945, fig. 28. The original manuscript is in the Munich State LibrarY,Cod. lat. 197, fol. 87r. 18. Jurgis Baltrusaitis, Le Moyen Age fantastique : antiquites et...
Winder, Marianne
PETSc: Features
Features Features Home Download Features Component Details Diagram GPUs Theads Documentation Applications/Publications Miscellaneous External Software Developers Site PETSc is intended for use in large-scale application projects, many ongoing computational science projects are built around the PETSc libraries. PETSc is easy to use for beginners. Moreover, its careful design allows advanced users to have detailed control over the solution process. PETSc includes a large suite of parallel linear, nonlinear equation solvers and ODE integrators that are easily used in application codes written in C, C++, Fortran and now Python. PETSc provides many of the mechanisms needed within parallel application codes, such as simple parallel matrix and vector assembly routines that allow the overlap of communication and computation.
Pressure transient method for front tracking
A pressure transient technique for tracking the advance of cold water fronts during water flooding and goethermal injection operations has been developed. The technique is based on the concept that the steady state pressure buildup in the reservoir region inside the front can be calculated by a fluid skin factor. By analyzing successive pressure falloff tests, the advance of the front in the reservoir can be monitored. The validity of the methods is demonstrated by application to three numerically simulated data sets, a nonisothermal step-rate injection test, a series of pressure falloffs in a multilayered reservoir, and a series of pressure falloff tests in a water flooded oil reservoir.
Benson, S.M.; Bodvarsson, G.S.
to relaxing or affect the stress distribution during operation of the wheel. 1 University of Applied Sciences fluxes) and then the mechanical simulation (stress-strain) using the transient temperature distribution and steam bubbles, as shown in Figure 2. At the beginning of the quenching, the entire wheel is surrounded
Functional test procedure, Fifth Wheel: SS-R42351, Issue D
This report describes the equipment required for initial assembly/maintenance and inspection/resetting of the Fifth Wheel system. It also gives a step-by-step procedure for initial assembly/maintenance inspection and procedures for resetting the system and Eager-Pac installation. The Fifth Wheel system is associated with a tractor-type vehicle used for materials handling.
Equiangular navigation and guidance of a wheeled mobile robot based on range-only measurements
We consider the problems of a wheeled mobile robot navigation and guidance towards an unknown stationary or maneuvering target using range-only measurements. We propose and study several methods for navigation and guidance termed Equiangular Navigation ... Keywords: Guidance, Navigation, Range-only measurements, Wheeled robots
Hamid Teimoori; Andrey V. Savkin
Rotor bore and turbine rotor wheel/spacer heat exchange flow circuit
In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in the spacers and wheels at circumferentially spaced positions enable egress of the compressor discharge air into the hot gas flow path. At turbine startup, cooling air flows through the closed-circuit steam passages to cool the outer rim of the rotor while compressor discharge air pre-warms the wheels and spacers. At steady-state, cooling steam is supplied in the closed-circuit steam-cooling passages and compressor discharge air is supplied through the bore and into the wheel space cavities to cool the rotor.
Caruso, Philip M. (Selkirk, NY); Eldrid, Sacheverel Quentin (Saratoga Springs, NY); Ladhani, Azad A. (Niskayuna, NY); DeMania, Alan Richard (Niskayuna, NY); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY); Rathbun, Lisa Shirley (Scotia, NY); Akin, Robert Craig (Schenectady, NY)
Bay Front Biomass Facility | Open Energy Information
Front Biomass Facility Front Biomass Facility Jump to: navigation, search Name Bay Front Biomass Facility Facility Bay Front Sector Biomass Location Ashland County, Wisconsin Coordinates 46.9794969°, -90.4824892° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":46.9794969,"lon":-90.4824892,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
Climatology of Strong Intermountain Cold Fronts
Motivated by the intensity and severity of winds and temperature falls that frequently accompany rapidly developing cold fronts in northern Utah, this paper presents a 25-yr climatology of strong cold frontal passages over the Intermountain West ...
Jason C. Shafer; W. James Steenburgh
On the Minimum Scale of Surface Fronts
A series of numerical experiments of a surface front forced by stretching deformation using Clark's nonhydrostatic model at very high resolution is presented. These simulations are compared to those reported by Williams who used hydrostatic ...
R. L. Gall; R. T. Williams; T. L. Clark
Moist Convection at a Surface Cold Front
The motion of a surface cold front in an environment that is unstable to moist convection is studied with the aid ofboth hydrostatic and nonhydrostatic two-dimensional models. Simulations with the hydrostatic model essentially extend the work ...
N. Andrew Crook
On the stability of subsonic thermal fronts
The stability of subsonic thermal fronts against corrugation is analyzed and an exact dispersion relation is obtained taking into account the compressibility of the gas. For heat fronts, this dispersion equation has an unstable root ({omega}{sub ex}) corresponding to the Landau-Darrieus unstable mode ({omega}{sub 0}) modified by the compressional effects. In particular, the exact solution shows a conspicuous maximum very close to the value of the intake Mach number M{sub 1} at which a Chapman-Jouguet deflagration wave behind the heat front is formed. Cooling fronts are stable for corrugation-like disturbances. A maximum damping as well as a maximum in the frequency occur at a value of M{sub 1} depending on the value of the normalized cooling q.
Ibanez S, Miguel H.; Shchekinov, Yuri; Bessega L, Maria C. [Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de los Andes, Apartado 26, Ipostel, La Hechicera, Merida (Venezuela); Department of Physics, University of Rostov, Rostov on Don, 34409 (Russian Federation); Centro de Fisica Teorica y Computacional, Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela)
Feature Article
Gasoline and Diesel Fuel Update (EIA)
Feature Article Feature Article * $ &RPSDULVRQ RI 6HOHFWHG (,$'DWD:LWK2WKHU'DWD 6RXUFHV A Comparison of Selected EIA-782 Data With Other Data Sources by Theresa E. Hallquist Introduction The Petroleum Marketing Division (PMD) of the Energy Information Administration (EIA) collects information re- lating to petroleum market prices and volumes on the EIA-782 survey. One way PMD assesses the quality of these data is to compare the data with other sources. Large, irreconcilable differences among data series could indicate the need for improvement in survey design or implementa- tion, or may be due to conceptual differences. For more de- tailed information on the EIA-782 survey, refer to the notes at the end of this article. PMD compares its EIA-782 series of petroleum market prices and volumes with both internal and external data sources
Stationary Shock Fronts in a Continuously Stratified Thermocline Model
Fronts are ubiquitous in the ocean. Recent work by Dewar has considered the formation of oceanic fronts in a simple layered model.
A. J. George Nurser
Electronic-nose for detecting environmental pollutants: signal processing and analog front-end design
Environmental monitoring relies on compact, portable sensor systems capable of detecting pollutants in real-time. An integrated chemical sensor array system is developed for detection and identification of environmental pollutants in diesel and gasoline ... Keywords: ADC, Analog front end, Chopper stabilization, Electronic nose, Feature extraction, Gas sensors
Hyuntae Kim; Bharatan Konnanath; Prasanna Sattigeri; Joseph Wang; Ashok Mulchandani; Nosang Myung; Marc A. Deshusses; Andreas Spanias; Bertan Bakkaloglu
AdS/QCD, Light-Front Holography, and Color Confinement
A remarkable holographic feature of dynamics in AdS space in five dimensions is that it is dual to Hamiltonian theory in physical space-time, quantized at fixed light-front time {\\tau} = t+z/c. This light-front holographic principle provides a precise relation between the bound-state amplitudes in AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The fifth dimension coordinate z is dual to the light front variable {\\zeta} describing the invariant separation of the quark constituents. The resulting valence Fock-state wavefunction eigensolutions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schr\\"odinger equation. The soft-wall dilaton profile exp ({\\kappa}^2 {\\zeta}^2) provides a model for the light-front potential which is color-confining and reproduces well the linear Regge behavior of the light-quark hadron spectrum in both L, the orbital angu...
Brodsky, Stanley J
Supai salt karst features: Holbrook Basin, Arizona
More than 300 sinkholes, fissures, depressions, and other collapse features occur along a 70 km (45 mi) dissolution front of the Permian Supai Formation, dipping northward into the Holbrook Basin, also called the Supai Salt Basin. The dissolution front is essentially coincident with the so-called Holbrook Anticline showing local dip reversal; rather than being of tectonic origin, this feature is likely a subsidence-induced monoclinal flexure caused by the northward migrating dissolution front. Three major areas are identified with distinctive attributes: (1) The Sinks, 10 km WNW of Snowflake, containing some 200 sinkholes up to 200 m diameter and 50 m depth, and joint controlled fissures and fissure-sinks; (2) Dry Lake Valley and contiguous areas containing large collapse fissures and sinkholes in jointed Coconino sandstone, some of which drained more than 50 acre-feet ({approximately}6 {times} 10{sup 4} m{sup 3}) of water overnight; and (3) the McCauley Sinks, a localized group of about 40 sinkholes 15 km SE of Winslow along Chevelon Creek, some showing essentially rectangular jointing in the surficial Coconino Formation. Similar salt karst features also occur between these three major areas. The range of features in Supai salt are distinctive, yet similar to those in other evaporate basins. The wide variety of dissolution/collapse features range in development from incipient surface expression to mature and old age. The features began forming at least by Pliocene time and continue to the present, with recent changes reportedly observed and verified on airphotos with 20 year repetition. The evaporate sequence along interstate transportation routes creates a strategic location for underground LPG storage in leached caverns. The existing 11 cavern field at Adamana is safely located about 25 miles away from the dissolution front, but further expansion initiatives will require thorough engineering evaluation.
Neal, J.T.
ALSNews Features
feed-image feed-image Digg: ALSBerkeleyLab Facebook Page: 208064938929 Flickr: advancedlightsource Twitter: ALSBerkeleyLab YouTube: AdvancedLightSource Home ALSNews Features ALSNews Features Students Get a Taste of ALS User Experience Print A group of seventh graders from Black Pine Circle (BPC) school in Berkeley recently had a rare opportunity to experience the ALS as "users" via a scientific research proposal project and field trip. The students were led by science and technology teacher Christine Mytko, who spent the past summer at the ALS through the Industry Initiatives for Science and Math Education (IISME) program. Mytko's time at the ALS was focused on 3D imaging and printing techniques. An integral part of the ISME program is educators taking their experiences back to the classroom through new curriculum development. As such, Mytko put together a program that would engage her students in collaborative proposal process similar to a typical ALS user proposal. Students worked in groups to craft proposals for scanning items of interest at the tomography beamline, a selection of which were chosen through a peer-review process and then scanned at Beamline 8.3.2. ALS beamline scientist Dula Parkinson worked with Mytko to develop the program and gave feedback on the kids' proposal, which Mytko says was thrilling for her students.
Structure and Evolution of Winter Cyclones in the Central United States and Their Effects on the Distribution of Precipitation. Part II: Arctic Fronts
The structure and evolution of a shallow but intense cold front (commonly referred to as an arctic front) and its associated precipitation features that passed through the central United States from 0000 UTC 9 March to 0000 UTC 10 March 1992 are ...
Peng-Yun Wang; Jonathan E. Martin; John D. Locatelli; Peter V. Hobbs
Light-Front Holography and the Light-Front Schrodinger Equation
One of the most important nonperturbative methods for solving QCD is quantization at fixed light-front time {tau} = t+z=c - Dirac's 'Front Form'. The eigenvalues of the light-front QCD Hamiltonian predict the hadron spectrum and the eigensolutions provide the light-front wavefunctions which describe hadron structure. More generally, we show that the valence Fock-state wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schrodinger equation, with an effective confining potential U which systematically incorporates the effects of higher quark and gluon Fock states. We outline a method for computing the required potential from first principles in QCD. The holographic mapping of gravity in AdS space to QCD, quantized at fixed light-front time, yields the same light front Schrodinger equation; in fact, the soft-wall AdS/QCD approach provides a model for the light-front potential which is color-confining and reproduces well the light-hadron spectrum. One also derives via light-front holography a precise relation between the bound-state amplitudes in the fifth dimension of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The elastic and transition form factors of the pion and the nucleons are found to be well described in this framework. The light-front AdS/QCD holographic approach thus gives a frame-independent first approximation of the color-confining dynamics, spectroscopy, and excitation spectra of relativistic light-quark bound states in QCD.
Brodsky, Stanley J.; de Teramond, Guy
Special Feature:
Five Five Questions for Sudip Dosanjh Special Feature: Five Questions for Sudip Dosanjh September 27, 2013 Sudip-wide.jpg Sudip Dosanjh Sudip Dosanjh is Director of the National Energy Research Scientific Computing (NERSC) Center at Lawrence Berkeley National Laboratory. NERSC's mission is to accelerate scientific discovery at the U.S. Department of Energy's Office of Science through high performance computing and extreme data analysis. NERSC deploys leading-edge computational and data resources for over 4,700 users from a broad range of disciplines. As a result of this support for science, NERSC users published 1,900 research papers in 2012. To continue its mission, NERSC will be partnering with computer companies to develop and deploy pre-exascale and exascale systems during the next
Chuck Ankenbrandt Chuck Ankenbrandt Chuck Ankenbrandt is our featured scientist this quarter. Chuck has been a Fermilab physicist since 1973 and is a member of the Accelerator Division. He is also heavily involved in educational activities at the Lab. As the father of five children ranging in age from 33 to 8 and the stepfather of four more, Chuck has had a lot of personal educational experience, too! Chuck, thanks for taking the time to talk with us. Would you start by telling us about your current activities at Fermilab? There are three main things now. I'm Experimental Coordinator for the Accelerator Division. I'm designing a high-intensity Fermilab Booster and I'm working with the Education Office on a variety of physics-related activities. What do you do as Experimental Coordinator?
DSD front models : nonideal explosive detonation
The Detonation Shock Dynamics (DSD) method for propagating detonation in numerical simulation of detonation in high explosive (HE) is based on three elements: (1) a subscale theory of multi-dimensional detonation that treats the evolving detonation as a front with dynamics that depends only on metrics of the front (such as curvature, etc.), (2) high-resolution direct numerical sirnuliltion of detonation serving both to test existing subscale theories and suggest modifications, and (3) physical experiments to characterize multi-dimensional detonation propagation on real explosives and to calibrate the front models for use in engineering simulations. In this paper we describe our work on all three of these elements of the DSD method as it applies to detonation in nonideal explosives.
Bdzil, J. B. (John Bohdan); Short, M. (Mark Short); Aslam, T. D. (Tariq D.); Catanach, R. A. (Richard A.); Hill, L. G. (Larry G.)
Apparatus and methods for aligning holes through wheels and spacers and stacking the wheels and spacers to form a turbine rotor
A gas turbine rotor stacking fixture includes upstanding bolts for reception in aligned bolt holes in superposed aft disk, wheels and spacers and upstanding alignment rods received in openings of the disk, wheels and spacers during the rotor stacking assembly. The axially registering openings enable insertion of thin-walled tubes circumferentially about the rim of the rotor, with tight tolerances to the openings to provide supply and return steam for cooling buckets. The alignment rods have radial dimensions substantially less than their dimensions in a circumferential direction to allow for radial opening misalignment due to thermal expansion, tolerance stack-up and wheel-to-spacer mismatch due to rabbet mechanical growth. The circumferential dimension of the alignment rods affords tightly toleranced alignment of the openings through which the cooling tubes are installed.
Berry, Robert Randolph (Greenville, SC); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY)
Hydrogen Pathways: Cost, Well-to-Wheels Energy Use, and Emissions...
A1-46612 September 2009 Hydrogen Pathways: Cost, Well-to-Wheels Energy Use, and Emissions for the Current Technology Status of Seven Hydrogen Production, Delivery, and Distribution...
Just build it! : a fully functional concept vehicle using robotic wheels
Interest in electric vehicle drive units is resurging with the proliferation of hybrid and electric vehicles. Currently emerging key-technologies are: in-wheel motors, electric braking, integrated steering activators and ...
Schmitt, Peter, S.M. Massachusetts Institute of Technology
An Instability of Mature Cold Fronts
An instability of a cold front possessing a low-level warm-band precursor is examined within an f-plane, quasi- and semigeostrophic framework. The basic frontal state is taken to be two-dimensional and of uniform potential vorticity. Theoretical ...
Christoph Sch�r; Huw C. Davies
An Objective Climatology of Carolina Coastal Fronts
This study describes a simple objective method to identify cases of coastal frontogenesis offshore of the Carolinas and to characterize the sensible weather associated with frontal passage at measurement sites near the coast. The identification method, based on surface hourly data from offshore and adjacent land stations, was applied to an 11-yr dataset (1984�94). A total of 379 coastal fronts was found, 70 of which eventually made landfall along the North Carolina coast; 112 that remained offshore, and 197 were termed diurnal since they remained offshore but disappeared during daylight hours. Results show that most coastal and offshore sites experience a wind shift of about 40��70 � and a warming of about 2��3�C during the hour of frontal passage. Exceptions include sites near colder waters where the rates are markedly reduced and frontal passage is often less discernible. Excluding diurnal fronts, just over half the cases were associated with cold-air damming (CAD) during the cold season of 16 October�15 April. Most of these winter cases linked with CAD were onshore fronts. During the warm season, most fronts were diurnal, but the association with CAD was still significant. To explore the synoptic-scale environment, composite maps for the cold season were generated for all three frontal subtypes from NCEP�NCAR reanalysis data. Results show a strong surface anticyclone
K. Wyat Appel; Allen J. Riordan; Timothy A. Holley
AdS/QCD and Applications of Light-Front Holography
Light-Front Holography leads to a rigorous connection between hadronic amplitudes in a higher dimensional anti-de Sitter (AdS) space and frame-independent light-front wavefunctions of hadrons in 3 + 1 physical space-time, thus providing a compelling physical interpretation of the AdS/CFT correspondence principle and AdS/QCD, a useful framework which describes the correspondence between theories in a modified AdS5 background and confining field theories in physical space-time. To a first semiclassical approximation, where quantum loops and quark masses are not included, this approach leads to a single-variable light-front Schroedinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The coordinate z in AdS space is uniquely identified with a Lorentz-invariant coordinate {zeta} which measures the separation of the constituents within a hadron at equal light-front time. The internal structure of hadrons is explicitly introduced and the angular momentum of the constituents plays a key role. We give an overview of the light-front holographic approach to strongly coupled QCD. In particular, we study the photon-to-meson transition form factors (TFFs) F{sub M{gamma}}(Q{sup 2}) for {gamma}{gamma}* {yields} M using light-front holographic methods. The results for the TFFs for the {eta} and {eta}' mesons are also presented. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined.
Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; Cao, Fu-Guang; /Massey U.; de Teramond, Guy F.; /Costa Rica U.
Light-Like Noncommutativity, Light-Front Quantization and New Light on UV/IR Mixing
We revisit the problem of quantizing field theories on noncommutative Moyal spacetime with \\emph{light-like} noncommutativity. To tackle the issues arising from noncommuting and hence nonlocal time, we argue that for this case light-front quantization procedure should be employed. In this appropriate quantization scheme we perform the non-planar loop analysis for the light-like noncommutative field theories. One of the important and peculiar features of light-front quantization is that the UV cutoff of the light-cone Hamiltonian manifests itself as an IR cutoff for the light-cone momentum, $p^+$. Due to this feature, the naive results of covariant quantization for the light-like case allude to the absence of the UV/IR mixing in the light-front quantization. However, by a careful analysis of non-planar loop integrals we show that this is not the case and the UV/IR mixing persists. In addition, we argue in favour of the perturbative unitarity of light-like noncommutative field theories in the light-front quantization scheme.
M. M. Sheikh-Jabbari; A. Tureanu
A Conservative Front Tracking Method in N-Dimensions
We propose a fully conservative Front Tracking algorithm for systems of nonlinear conservation laws. The algorithm can be applied uniformly in one, two, three and N dimensions. Implementation details for this algorithm ... Keywords: Front tracking, conservation, discontinuity
Jinjie Liu; Hyun-Kyung Lim; James Glimm; Xiaolin Li
The Vertical Structure of New England Coastal Fronts
Aircraft data from the New England Winter Storms Experiment (NEWSEX) are used to examine the vertical structure of four New England coastal fronts. The aircraft made multiple passes at varying elevations through the coastal fronts. The ...
John W. Nielsen; Peter P. Neilley
Mutual Intrusion of a Gravity Current and Density Front Formation
A two-dimensional prognostic model was employed to examine the mutual intrusion of a gravity current and the formation of a density front. The results indicated strong vertical motion near the front and, with Earth rotation included, a baroclinic ...
Dono-Ping Wang
Progress with the SNS front-end systems
47317 PROGRESS WITH THE SNS FRONT-END SYSTEMS* R. Keller,**the FES Team, �Status of the SNS Front-End Sys- tems, Paperof the LEBT Layout for SNS,� Paper MOD19, Linac 2000,
Gust Front Characteristics as Detected by Doppler Radar
Gust fronts produce low altitude wind shear that can be hazardous to aircraft operations, especially during takeoff and landing. Radar meteorologists have long been able to identify gust front signatures in Doppler radar data, but in order to use ...
Diana L. Klingle; David R. Smith; Marilyn M. Wolfson
Front Range Energy LLC | Open Energy Information
Energy LLC Energy LLC Jump to: navigation, search Logo: Front Range Energy LLC Name Front Range Energy LLC Address 31375 Great Western Dr Place Windsor, Colorado Zip 80550 Sector Biofuels Product Ethanol producer Website http://www.frontrangeenergy.co Coordinates 40.4605154°, -104.8565272° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.4605154,"lon":-104.8565272,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
Pentan isomers compound flame front structure
The fuels (hexane, pentane, diethyl ether) and conditions investigated in this study are relevant to engine knock in spark- ignition engines. A review is provided of the field of low temperature hydrocarbon oxidation. Studies were made of radical and stable intermediate distribution in the front of cool flames: Maximum concentrations of H atoms and peroxy radicals were observed in the luminous zone of the cool flame front. Peroxy radicals appear before the luminous zone at 430 K due to diffusion. H atoms were found in cool flames of butane and hexane. H atoms diffuses from the luminous zone to the side of the fresh mixture, and they penetrate into the fresh mixture to a small depth. Extension of action sphear of peroxy radicals in the fresh mixture is much greater than that of H atoms due to their small activity and high concentrations.
Mansurov, Z.A.; Mironenko, A.W.; Bodikov, D.U.; Rachmetkaliev, K.N. [Kazakh Al-Farabi State National Univ., Almaty (Kazakhstan)
Front contact solar cell with formed emitter
A bipolar solar cell includes a backside junction formed by an N-type silicon substrate and a P-type polysilicon emitter formed on the backside of the solar cell. An antireflection layer may be formed on a textured front surface of the silicon substrate. A negative polarity metal contact on the front side of the solar cell makes an electrical connection to the substrate, while a positive polarity metal contact on the backside of the solar cell makes an electrical connection to the polysilicon emitter. An external electrical circuit may be connected to the negative and positive metal contacts to be powered by the solar cell. The positive polarity metal contact may form an infrared reflecting layer with an underlying dielectric layer for increased solar radiation collection.
Cousins, Peter John (Menlo Park, CA)
Thermally induced wave-front distortions in laser windows
A simple analytical expression is given for wave-front distortions and birefringence due to heating in laser windows. (AIP)
Greninger, C.E.
An improved front tracking method for the Euler equations
An improved front tracking method for hyperbolic conservation laws is presented. The improved method accurately resolves discontinuities as well as continuous phenomena. The method is based on an improved front interaction model for a physically more ... Keywords: 35L65, 35L67, 65M12, 76L05, 76N15, Euler equations, Front tracking, Gas dynamics, Hyperbolic conservation laws
J. A. S. Witteveen; B. Koren; P. G. Bakker
NETL: Features - May 2012
2 DOE's National Science Bowl Crowns Winners 2012 National Science Bowl high school competitors in front of the National 4-H Youth Conference Center in Chevy Chase, MD. 2012...
The Resonant Interaction of a Tropical Cyclone and a Tropopause Front in a Barotropic Model. Part I: Zonally Oriented Front
The interaction of a tropical cyclone and a zonally aligned tropopause front is investigated in an idealized framework. A nondivergent barotropic model is used in which the front is represented by a vorticity step, giving a jetlike velocity ...
Leonhard Scheck; Sarah C. Jones; Martin Juckes
DOE Hydrogen and Fuel Cells Program: Well-to-Wheels Case Studies for
Hydrogen Production Hydrogen Production Hydrogen Delivery Hydrogen Storage Hydrogen Manufacturing Fuel Cells Applications/Technology Validation Safety Codes and Standards Education Basic Research Systems Analysis Analysis Repository H2A Analysis Hydrogen Analysis Resource Center Scenario Analysis Well-to-Wheels Analysis Systems Integration U.S. Department of Energy Search help Home > Systems Analysis > Well-to-Wheels Analysis Printable Version Well-to-Wheels Case Studies for Hydrogen Pathways The ultimate goal is for hydrogen to be produced and delivered utilizing several feedstocks, processing methods, and delivery options at a variety of scales ranging from large central production to very small local (distributed) production, depending on what makes the most economic and logistical sense for a given location. These parameters and the
The Wheels on the Bus Go Round and Round... | Department of Energy
The Wheels on the Bus Go Round and Round... The Wheels on the Bus Go Round and Round... The Wheels on the Bus Go Round and Round... March 9, 2010 - 5:30am Addthis Shannon Brescher Shea Communications Manager, Clean Cities Program I have a love/hate relationship with buses. I love that they save me gasoline, are more efficient than driving a car, and reduce my greenhouse gas emissions. However, I hate them when they're running late! But there is one category of buses that I'm particularly fond of - those that run on alternative fuels. In fact, alternative fuel and advanced technology transit buses offer a number of health, environmental, and social benefits. As anyone who has walked behind a traditional diesel bus knows, the plume of black smoke from its tailpipe is both unpleasant and unhealthy. That
Simulation of 7050 Wrought Aluminum Alloy Wheel Die Forging and its Defects Analysis based on DEFORM
Defects such as folding, intercrystalline cracking and flow lines outcrop are very likely to occur in the forging of aluminum alloy. Moreover, it is difficult to achieve the optimal set of process parameters just by trial and error within an industrial environment. In producing 7050 wrought aluminum alloy wheel, a rigid-plastic finite element method (FEM) analysis has been performed to optimize die forging process. Processing parameters were analyzed, focusing on the effects of punch speed, friction factor and temperature. Meanwhile, mechanism as well as the evolution with respect to the defects of the wrought wheel was studied in details. From an analysis of the results, isothermal die forging was proposed for producing 7050 aluminum alloy wheel with good mechanical properties. Finally, verification experiment was carried out on hydropress.
Huang Shiquan; Yi Youping; Zhang Yuxun [School of Mechanical and Electrical Engineering, Central South University, Changsha 410083 (China)
Feature - Testing the Tesla
Testing the Tesla Testing the Tesla Tesla test Technician Geoff Amann takes the Tesla.through a driving cycle on Argonne's dynamometers. Argonne transportation engineers recently evaluated an all-electric Tesla Roadster at the Advanced Powertrain Research Facility's new two-wheel drive dynamometer laboratory. Data obtained from the Tesla will help researchers develop test procedures that provide an unbiased, consistent and practical approach to evaluating electric vehicles. "As we study these advanced vehicles, our knowledge base of the progression of vehicle electrification technology is enhanced," said chief engineer Mike Duoba. "In a rigorous, controlled manner, we are able to study many vehicle operating conditions to determine the impact on fuel consumption.
Influence of track conditions and wheel wear state on the loads imposed on the infrastructure by railway vehicles
Nowadays, one of the most sensible issues in the railway industry is the damage on vehicles caused by the track conditions and the infrastructure deterioration due to the trains' passage. Therefore, it is essential to acquire a better understanding on ... Keywords: Railway dynamics, Track irregularities, Vehicle-track interaction, Wheel profiles wear, Wheel-rail contact
J. Pombo; J. Ambr�Sio; M. Pereira; R. Verardi; C. Ariaudo; N. Kuka
Theoretical and experimental analysis of desiccant wheel performance for low humidity drying system
The drying process is influenced by three main factors temperature, flow rate and humidity, resulting in the drying process of hot air required in accordance with the character of materials with low humidity, so it can speed up the drying process. Malaysia ... Keywords: desiccant wheel, temperature and humidity, water evaporation
Tri Suyono; Sohif Mat; Muhammad Yahya; Muhd. Hafiz Ruslan; Azami Zaharim; Kamaruzzaman Sopian
Enthalpy Wheels Come of Age: Applying Energy Recovery Ventilation to Hospitality Venues in Hot, Humid Climate
Energy recovery ventilation systems, including rotary heat exchangers or enthalpy wheels, utilize mature technologies that are routinely applied in commercial buildings. Energy recovery is particularly important in buildings with significant outdoor air intake requirements and has recently become widely accepted in applications such as schools and theatres. Hospitality applications including restaurants, bars, casinos and similar settings also stand to benefit from application of the technology, however, there is a lack of experience and therefore of accepted guidance in these applications. Furthermore, the unique challenges inherent in the variety of hospitality venues may limit appropriate use of the technology. Applying energy recovery ventilation to hospitality venues in hot, humid climates need not be complex. This paper proposes guidelines that can facilitate application of the technology by specifiers or other construction professionals. These guidelines address evaluation of typical projects for the suitability of energy recovery, selection of appropriate energy recovery ventilation technology, and criteria for successful application of enthalpy wheels. Examples of applications developed for different mechanical systems and building types are provided. The literature describing the opportunities and limitations associated with enthalpy wheels is summarized and referenced. Installation, operation, and maintenance insights are presented, derived from the body of industry experience with enthalpy wheels.
Wellford, B. W.
The effect of cognitive load on adaptation to differences in steering wheel force feedback level
In an earlier study it was found that drivers can adjust quickly to different force feedback levels on the steering wheel, even for such extreme levels as zero feedback. It was hypothesized that, due to lack of cognitive load, participants could easily ... Keywords: lane keeping, steer-by-wire, steering feedback, steering systems
Swethan Anand, Jacques Terken, Jeroen Hogema
A Design of Reconfigurable Satellite Control System with Reaction Wheels Based on Error Quaternion Model
To meet the requirement of the satellite attitude and orbit control system (AOCS) could recover control in abnormal conditions, A reconfigurable control system using variable-structure control and improved pseudo-inverse is developed based on the error ... Keywords: pseudo-inverse, variable-structure, reconfigurable, reaction wheel, error quaternion
Peijun Yu; Keqiang Xia; Jiancheng Li
Well-to-Wheels Analysis of Biofuels and Plug-In Hybrids
Well-to-Wheels Analysis of Biofuels and Plug-In Hybrids Michael Wang Center for Transportation such as hydrogen and biofuels Pursuing reductions in transportation GHG emissions now demands for intensive sorghum GREET Includes Some of the Potential Biofuel Production Pathways Starch Crops for EtOH Corn
Argonne National Laboratory
Preparation for turning a Bucket Wheel Reclaimer into a robotic arm
This paper presents the ground work prepared for turning a Bucket Wheel Reclaimer (BWR) into a robotic arm for operation automation. BWR has been widely used in dealing with bulk materials by removing them from the conveyor and stack them as well as ...
Rayleigh-Taylor Instability of Ionization Front around Black Holes
We examine the role of ionizing radiation emitted from black holes (BHs) in suppressing the growth of the Rayleigh-Taylor instability (RTI) across the ionization front (I-front) that forms when the gas fueling the BH is neutral. We use radiation-hydrodynamic simulations to show that the RTI is suppressed for non-accelerating fronts on all scales resolved in our simulations. A necessary condition for the stability of the I-front is that the radius of the Str\\"omgren sphere is larger than the Bondi radius. When this condition is violated the I-front collapses producing an accretion luminosity burst. Transient growth of the RTI occurs only during the accretion burst when the effective acceleration in the frame of reference of the I-front increases significantly due to the rapid expansion of the Str\\"omgren sphere.
Park, KwangHo; Di Matteo, Tiziana; Reynolds, Christopher S
Front Tracking Model of Simultaneous Melting and Solidification ...
This results in dynamic melting and solidification throughout the weld pool, which can be modelled using the authors' Front Tracking algorithm. Melting is�...
In-situ combustion process simulator with a moving-front representation. [THERMS
A description is given of THERMS a new three phase, black-oil simulator for in-situ combustion processes. The model also can simulate steam and hot-water injection operations. To simulate field-scale in-situ combustion projects, THERMS uses experimental data obtained from laboratory combustion-tube runs. Detailed kinetics and thermodynamic relations are not used. The model treats the burning zone as a moving front. The front is viewed not only as a moving heat source, but also as a displacement pump enhancing oil flow. This approach results in a new algorithm. The model has been designed with strongly field-oriented features. Its utility is illustrated by a history-matching study of the South Belridge, CA, dry-combustion pilot test. 11 refs.
Hwang, M.K.; Jines, W.R.; Odeh, A.S.
Front contact solar cell with formed electrically conducting layers on the front side and backside
A bipolar solar cell includes a backside junction formed by a silicon substrate and a first doped layer of a first dopant type on the backside of the solar cell. A second doped layer of a second dopant type makes an electrical connection to the substrate from the front side of the solar cell. A first metal contact of a first electrical polarity electrically connects to the first doped layer on the backside of the solar cell, and a second metal contact of a second electrical polarity electrically connects to the second doped layer on the front side of the solar cell. An external electrical circuit may be electrically connected to the first and second metal contacts to be powered by the solar cell.
Cousins, Peter John
FLUCTUATIONS OF THE FRONT IN A STOCHASTIC COMBUSTION MODEL #1; (FLUCTUATIONS DU FRONT DANS UN MOD�?LE DE COMBUSTION) FRANCIS COMETS 1 , JEREMY QUASTEL 2 AND ALEJANDRO F. RAMÍREZ 3 Abstract. We consider an interacting particle system on the one dimensional lattice Z modeling combustion. The process
Quastel, Jeremy
Combustion fronts in porous media with two layers Steve Schecter
Combustion fronts in porous media with two layers layer 1 layer 2 Steve Schecter North Carolina Subject: Propagation of a combustion front through a porous medium with two parallel layers having different properties. · Each layer admits a traveling combustion wave. · The layers are coupled by heat
Schecter, Stephen
On the existence of high Lewis number combustion fronts
We study a mathematical model for high Lewis number combustion processes with the reaction rate of the form of an Arrhenius law with or without an ignition cut-off. An efficient method for the proof of the existence and uniqueness of combustion fronts ... Keywords: Combustion fronts, Geometric singular perturbation theory, Ignition cut-off
Anna Ghazaryan; Christopher Jones
Investigation of the Brazil Current front variability from altimeter data
Investigation of the Brazil Current front variability from altimeter data Gustavo J. Goni Atlantic, Brazil Abstract. The southwestern Atlantic Ocean is characterized by the confluence of the Brazil in conjunction with a two-layer dynamical ocean scheme to monitor the Brazil Current front and to investigate its
Topographic Effects on a Wintertime Cold Front in Taiwan
This paper describes an observational and numerical study of an intense wintertime cold front that occurred in Taiwan on 8 January 1996. The front was associated with rope clouds at the leading edge, and a broad area of stratiform clouds behind. ...
Fang-Ching Chien; Ying-Hwa Kuo
Wind-Driven Motion near a Shelf-Slope Front
A two-dimensional, two-layered frontal system is used to examine the wind-driven motion near a shelf-slope front. In the linear regime, the along-frontal current is characterized by barotropic perturbations. The front is dynamically passive and ...
Hsien Wang Ou
Front lighted optical tooling method and apparatus
An optical tooling method and apparatus uses a front lighted shadowgraphic technique to enhance visual contrast of reflected light. The apparatus includes an optical assembly including a fiducial mark, such as cross hairs, reflecting polarized light with a first polarization, a polarizing element backing the fiducial mark and a reflective surface backing the polarizing element for reflecting polarized light bypassing the fiducial mark and traveling through the polarizing element. The light reflected by the reflecting surface is directed through a second pass of the polarizing element toward the frontal direction with a polarization differing from the polarization of the light reflected by the fiducial mark. When used as a tooling target, the optical assembly may be mounted directly to a reference surface or may be secured in a mounting, such as a magnetic mounting. The optical assembly may also be mounted in a plane defining structure and used as a spherometer in conjunction with an optical depth measuring instrument. A method of measuring a radius of curvature of an unknown surface includes positioning the spherometer on a surface between the surface and a depth measuring optical instrument. As the spherometer is frontally illuminated, the distance from the depth measuring instrument to the fiducial mark and the underlying surface are alternately measured and the difference in these measurements is used as the sagittal height to calculate a radius of curvature.
Stone, William J. (Kansas City, MO)
Integration of a testbed for examining the interaction of Mars rover wheels with a Mars soil simulant
Integration and experimental testing was performed on a testbed for examining the interaction of Mars rover wheels with a Mars soil simulant. The testbed included a horizontal carriage that had a encoder to measure the ...
Okafor, Chiedozie A. (Chiedozie Arinze)
Delayed muons in extensive air showers and double-front showers
The results of a long-term experiment performed in the period between 1995 and 2006 with the aid of the MUON-T underground (20 mwe) scintillation facility arranged at the Tien Shan mountain research station at an altitude of 3340 m above sea level are presented. The time distribution of delayed muons with an energy in excess of 5 GeV in extensive air showers of energy not lower than 106 GeV with respect to the shower front was obtained with a high statistical significance in the delay interval between 30 and 150 ns. An effect of the geomagnetic field in detecting delayed muons in extensive air showers was discovered. This effect leads to the asymmetry of their appearance with respect to the north-south direction. The connection between delayed muons and extensive air showers featuring two fronts separated by a time interval of several tens of to two hundred nanoseconds is discussed. This connection gives sufficient grounds to assume that delayed muons originate from the decays of pions and kaons produced in the second, delayed, front of extensive air showers.
Beisembaev, R. U.; Vavilov, Yu. N., E-mail: email@example.com; Vildanov, N. G.; Kruglov, A. V.; Stepanov, A. V. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation); Takibaev, J. S. [Al-Farabi Kazakh National University (Kazakhstan)
Light-Front Holographic QCD and the Confinement Potential
Light-Front Hamiltonian theory, derived from the quantization of the QCD Lagrangian at fixed light-front time \\tau = t+z/c, provides a rigorous frame-independent framework for solving nonperturbative QCD. The eigenvalues of the light-front QCD Hamiltonian predict the hadronic mass spectrum, and the eigensolutions provide the light-front wavefunctions describing hadron structure. The valence Fock-state wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schrodinger equation, with an effective confining potential U which systematically incorporates the effects of higher quark and gluon Fock states. The potential U has a unique form if one requires that the action for zero quark mass remains conformally invariant. The holographic mapping of gravity in AdS space to QCD with a specific soft-wall dilaton yields the same light-front Schrodinger equation. It also gives a precise relation between the bound-state amplitudes in the fifth dimension z of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The elastic and transition form factors of the pion and the nucleons are found to be well described in this framework. The predictions include a zero-mass pion in the chiral limit, and linear Regge trajectories with the same slope in the radial quantum number n and orbital angular momentum L. The light-front AdS/QCD holographic approach thus gives a frame-independent representation of color-confining dynamics and the excitation spectra of light-quark hadrons in terms of a single mass parameter. We also discuss the implications of the underlying conformal template of QCD for renormalization scale-setting and the implications of light-front quantization for the value of the cosmological constant.
Stanley J. Brodsky; Guy F. de T�ramond; Hans G�nter Dosch
Helicase activity on DNA as a propagating front
We develop a propagating front analysis, in terms of a local probability of zipping, for the helicase activity of opening up a double stranded DNA (dsDNA). In a fixed-distance ensemble (conjugate to the fixed-force ensemble) the front separates the zipped and unzipped phases of a dsDNA and a drive acts locally around the front. Bounds from variational analysis and numerical estimates for the speed of a helicase are obtained. Different types of helicase behaviours can be distinguished by the nature of the drive.
Somendra M. Bhattacharjee
Light front approach to correlations in hot quark matter
We investigate two-quark correlations in hot and dense quark matter. To this end we use the light front field theory extended to finite temperature $T$ and chemical potential $\\mu$. Therefore it is necessary to develop quantum statistics formulated on the light front plane. As a test case for light front quantization at finite $T$ and $\\mu$ we consider the NJL model. The solution of the in-medium gap equation leads to a constituent quark mass which depends on $T$ and $\\mu$. Two-quark systems are considered in the pionic and diquark channel. We compute the masses of the two-body system using a $T$-matrix approach.
S. Strauss; M. Beyer; S. Mattiello
Cold Fronts Research Programme: Progress, Future Plans, and Research Directions
Following the analysis of data collected during Phases land II of the Cold Fronts Research Programme (CFRP) a conceptual model for the Australian summertime �cool change� has been proposed. The model provides a focus and a framework for the ...
B. F. Ryan; J. R. Garratt; K. J. Wilson; R. K. Smith
Diabatically Driven Discrete Propagation of Surface Fronts: A Numerical Analysis
Discrete frontal propagation has been identified as a process whereby a surface front discontinuously moves forward, without evidence of frontal passage across a mesoscale region. Numerical simulations are employed to examine the upper-level ...
George H. Bryan; J. Michael Fritsch
A Marker Chain Front Tracking Method for Modelling Meniscus ...
Feb 1, 2002 ... A Marker Chain Front Tracking Method for Modelling Meniscus Dynamics in the Al Ingot Casting Process by F. Iversen, J.A. Bakken and S.T.�...
Formation and Maintenance of Shelfbreak Fronts in an Unstratified Flow
A depth-averaged model with no density variations was used by Chapman to describe the formation of a passive tracer front at a shelfbreak. The relevance of this frontogenesis mechanism to cases that allow vertical variations is examined by ...
Glen Gawarkiewicz; David C. Chapman
Internal-Inertial Waves in a Surgasso Sea Front
This work examines the presence of internal-inertial waves in a front in the North Atlantic subtropical convergence zone. Results of Doppler shear profiler and towed thermistor chain surveys are displayed to document the position and magnitude of ...
Richard P. Mied; Colin Y. Shen; Clifford L. Trump; Gloria J. Lindemann
Cold Fronts Research: The Australian Summertime �Cool Change�
Much of the significant weather of southeastern Australia is associated with the passage of cold fronts. In summer, such passages are often accompanied by rapid and extreme temperature fails, as hot continental northerly winds are replaced with ...
R. K. Smith; B. F. Ryan; A. J. Troup; K. J. Wilson
Meteorological Tower Measurements of a Surface Cold Front
measurements from the Boulder Atmospheric Observatory meteorological research tower are used to describe the structure and physical processes of a strong surface cold front. Analysis reveals that the horizontal gradients in temperature and wind ...
M. A. Shapiro
Tracking Gravity Waves in Baroclinic Jet-Front Systems
Using a two-dimensional Fourier decomposition and a four-dimensional ray-tracing technique, the propagating characteristics and source mechanisms of mesoscale gravity waves simulated in idealized baroclinic jet-front systems are investigated. The ...
Yonghui Lin; Fuqing Zhang
Advanced integrated safeguards using front-end-triggering devices
This report addresses potential uses of front-end-triggering devices for enhanced safeguards. Such systems incorporate video surveillance as well as radiation and other sensors. Also covered in the report are integration issues and analysis techniques.
Howell, J.A.; Whitty, W.J.
The Circulation Dynamics and Thermodynamics of Upper Ocean Density Fronts
This paper extends a previous hydrodynamic circulation model of established, persistent upper ocean density fronts by including a thermodynamic or buoyancy equation in the integral treatment. An analysis is also conducted of the variables related ...
Richard W. Garvine
Generation and Separation of Mesoscale Eddies from Surface Ocean Fronts
This study is motivated by Arctic Ocean observations of sub-mixed layer eddies found at large distances from their assumed formation region of a surface ocean front. We explore eddy formation through high resolution numerical simulations of ...
Georgy E. Manucharyan; Mary-Louise Timmermans
Vertical Velocities in a Thunderstorm Gust Front and Outflow
Continuous vertically pointing measurements of a thunderstorm outflow, including its gust front, were obtained with a Doppler radar near New Salem, North Dakota. The measurements provide a high-resolution depiction of the vertical structure of ...
Brooks E. Martner
Misocyclone Characteristics along Florida Gust Fronts during CaPE
Multiple-Doppler radar and rawinsonde data are used to examine misocyclone characteristics along gust fronts observed during the Convection and Precipitation/Electrification (CaPE) project in Florida. The objective of this study is to investigate ...
Katja Friedrich; David E. Kingsmill; Carl R. Young
DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility...
DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho Uranium Enrichment Project to Create Over 1,000 Jobs in Idaho Washington, DC As part of a broad...
Observations of Seven Atmospheric Density Current Fronts in Dixon, California
Seven atmospheric density current fronts are identified in sequences of ground-based, scanning aerosol backscatter lidar images and in situ micrometeorological time series data that were collected simultaneously and nearly continuously between 15 ...
Shane D. Mayor
Results of the SNS front end commissioning at Berkeley Lab
RESULTS OF THE SNS FRONT END COMMISSIONING AT BERKELEY LAB *USA A. Aleksandrov for the SNS Accelerator Physics Group andT. Shea for the SNS Beam Diagnostics Collaboration Oak Ridge
The Behavior of Dry Cold Fronts Traveling Along a Coastline
Observations of intense, dry summertime cold fronts in southeast Australia provide evidence for frontal deformation (cold air surges) in the coastal region well to the west of the main mountain range. This compares with the severe deformation ...
J. R. Garratt; P. A. C. Howells; E. Kowalczyk
A Geostrophic Adjustment Model of a Tidal Mixing Front
This paper presents a model of a tidal mixing front as occurring between well mixed and (seasonally) stratified water in tidally energetic areas in continental shelf seas. The model examines the geostrophic adjustment of a stratified two-layer ...
G. J. F. van Heijst
Influence of Mesoscale Orography on Idealized Cold Fronts
A three-dimensional numerical model based on the inviscid and adiabatic primitive equations in the Boussinesq approximation is used to investigate the retardation of cold fronts by high two and three-dimensional mountains, approximately the same ...
U. Schumann
Town of Front Royal, Virginia (Utility Company) | Open Energy Information
Town of Front Royal, Virginia (Utility Company) Town of Front Royal, Virginia (Utility Company) Jump to: navigation, search Name Town of Front Royal Place Virginia Utility Id 6803 Utility Location Yes Ownership M NERC Location SERC Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Commercial Dusk to Dawn Light poles Commercial Residential Residential Average Rates Residential: $0.0928/kWh Commercial: $0.0796/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Town_of_Front_Royal,_Virginia_(Utility_Company)&oldid=411737"
Front Range Forest Health Partnership Phase 1 feasibility study
The Front Range Forest Health Partnership is an alliance of individuals, citizen groups, federal, state, private, and nonprofit organizations that formed to promote forest health restoration and reduce fire risks on Colorado's Front Range. The partnership promotes selective thinning to restore forest health and supports economically feasible end uses for wood waste materials. The Phase I study was initiated to determine the environmental and economic feasibility of using wood wastes from forested and urban areas for the production of fuel-grade ethanol.
Volkin, P
Parametric Study of Front-End Nuclear Fuel Cycle Costs
This study provides an overview of front-end fuel cost components for nuclear plants, specifically uranium concentrates, uranium conversion services, uranium enrichment services, and nuclear fuel fabrication services. A parametric analysis of light-water reactor (LWR) fuel cycle costs is also included in order to quantify the impacts that result from changes in the cost of one or more front-end components on overall fuel cycle costs.
PETSc: Features: Thread support
Thread support Home Download Features Component Details Diagram GPUs Threads Documentation ApplicationsPublications Miscellaneous External Software Developers Site PETSc algebraic...
DOE Hydrogen and Fuel Cells Program Record 5012a: Well-to-Wheels Analyses for Solar and Wind Hydrogen Production
DOE Hydrogen and Fuel Cells Program Record DOE Hydrogen and Fuel Cells Program Record Record #: 5012a Date: December 21, 2005 Title: Well-to-Wheels Analyses for Solar & Wind Hydrogen Production Originator: Roxanne Garland Approved by: JoAnn Milliken Date: January 6, 2006 Item: This record explains the basis for the differences between the analyses of well-to-wheels energy use and greenhouse gas emissions conducted via Argonne National Laboratory's GREET Model, cited in the U.S. Department of Energy's Solar and Wind Technologies for Hydrogen Production Report to Congress, 1 and those conducted by the National Research Council, cited in the report The Hydrogen Economy: Opportunities, Costs, Barriers, and R&D Needs. 2 Well-to-Wheels Energy Use and Greenhouse Gas Emissions - Argonne National
Cross-Front Mixing and Frontal Upwelling in a Controlled Quasi-Permanent Density Front in the Gulf of St. Lawrence
CTD data obtained from three transects across a controlled quasi-permanent density front in the Gulf of St. Lawrence were analyzed for the purpose of investigating cross-front mixing, mechanisms for frontal convergence, secondary circulation ...
C. L. Tang
NETL's Supercomputer Addresses Energy Issues on Two Fronts | Department of
NETL's Supercomputer Addresses Energy Issues on Two Fronts NETL's Supercomputer Addresses Energy Issues on Two Fronts NETL's Supercomputer Addresses Energy Issues on Two Fronts September 26, 2013 - 10:42am Addthis The visualization center for the SBEUC (Simulation Based Engineering User Center). Located at the Departmentâs National Energy Technology Laboratory in Morgantown, W. Va., the SBEUC will be powered by a high performance computer that will allow researchers to simulate phenomena that are difficult or impossible to probe experimentally. The results from simulations will become accessible through user centers that provide advanced visualization capabilities and foster collaboration among researchers. The SBEUC will be used for developing and deploying simulation tools required for overcoming energy technology barriers quickly and reliably.
Methods for enhancing mapping of thermal fronts in oil recovery
A method for enhancing the resistivity contrasts of a thermal front in an oil recovery production field as measured by the CSAMT technique is disclosed. This method includes the steps of: (a) preparing a CSAMT-determined topological resistivity map of the production field; (b) introducing a solution of a dopant material into the production field at a concentration effective to alter the resistivity associated with the thermal front; said dopant material having a high cation exchange capacity which might be selected from the group consisting of montmorillonite, illite, and chlorite clays; said material being soluble in the connate water of the production field; (c) preparing a CSAMT-determined topological resistivity map of the production field while said dopant material is moving therethrough; and (d) mathematically comparing the maps from step (a) and step (c) to determine the location of the thermal front. This method is effective with the steam flood, fire flood and water flood techniques.
Lee, David O. (Albuquerque, NM); Montoya, Paul C. (Albuquerque, NM); Wayland, Jr., James R. (Albuquerque, NM)
Rayleigh-Taylor Instability at Ionization Fronts: Perturbation Analysis
The linear growth rate of the Rayleigh-Taylor instability (RTI) at ionization fronts is investigated via perturbation analysis in the limit of incompressible fluids. In agreement with previous numerical studies is found that absorption of ionizing radiation inside the HII region due to hydrogen recombinations suppresses the growth of instabilities. In the limit of a large density contrast at the ionization front the RTI growth rate has the simple analytical solution n=-nur+(nur^2+gk)^(1/2), where nur is the hydrogen recombination rate inside the HII region, k is the perturbation's wavenumber and g is the effective acceleration in the frame of reference of the front. Therefore, the growth of surface perturbations with wavelengths lambda >> lambda_{cr} = 2\\pi g/nur^2 is suppressed by a factor (lambda_{cr}/4lambda)^(1/2) with respect to the non-radiative incompressible RTI. Implications on stellar and black hole feedback are briefly discussed.
Ricotti, Massimo
A method for enhancing the resistivity contrasts of a thermal front in an oil recovery production field as measured by the controlled source audio frequency magnetotelluric (CSAMT) technique is disclosed. This method includes the steps of: (1) preparing a CSAMT-determined topological resistivity map of the production field; (2) introducing a solution of a dopant material into the production field at a concentration effective to alter the resistivity associated with the thermal front; said dopant material having a high cation exchange capacity which might be selected from the group consisting of montmorillonite, illite, and chlorite clays; said material being soluble in the conate water of the production field; (3) preparing a CSAMT-determined topological resistivity map of the production field while said dopant material is moving therethrough; and (4) mathematically comparing the maps from step (1) and step (3) to determine the location of the thermal front. This method is effective with the steam flood, fire flood and water flood techniques.
Lee, D.O.; Montoya, P.C.; Wayland, J.R. Jr.
NREL: NEWS - Features
Bookmark and Share Printable Version Bookmark and Share Printable Version Feature News The following feature stories take an in-depth, behind-the-scenes look at how NREL is advancing energy efficiency and renewable energy technologies. You may subscribe to receive weekly news features by e-mail or via RSS feed. NREL Features RSS Feed (XML) 2013 December 2013 New Test Facility to Improve Wind Turbines New Test Facility to Improve Wind Turbines Five-megawatt dynamometer will accelerate the development of next-generation wind energy technologies. Bright Ideas Chase Investor Dollars at Forum Bright Ideas Chase Investor Dollars at Forum Annual Industry Growth Forum sponsored by NREL is where green technology seeks greenbacks. NREL Takes Efficiency to the Great Outdoors NREL Takes Efficiency to the Great Outdoors
Argonne Transportation Technology R&D Center - APRF - Four-wheel Drive
Four-Wheel Drive Chassis Dynamometer Test Cell Argonne has lead responsibility for a project with the U.S. Department of Energy's (DOE's) Vehicle Technologies Program to conduct emission and energy-efficiency tests on hybrid electric vehicles (HEVs), sport utility vehicles, and advanced technology vehicles. These tests require a state-of-the-art electric four-wheel-drive (4WD) chassis dynamometer in a climate-controlled environment with appropriate controls and instrumentation for highly accurate emissions and fuel measurements. This test cell was built as part of the Advanced Powertrain Research Facility. 4WD Chassis Dynamometer Argonne obtained professional engineering/architectural services to assist with the preliminary design and construction documents for a world-class facility capable of benchmarking and developing the most advanced powertrains for future cars and trucks, and to have equipment ready for SULEV (super ultra low emission vehicle) and a full dilution tunnel for measurements of diesel particulate matter. The total test cell design was approximately 75% completed and the building foundation was finished in November 2000. Major equipment, such as the dynamometer, constant volume sampler, and emission bench, was ordered and built. A grand opening ceremony was held November 15, 2002.
HINS Linac front end focusing system R&D
This report summarizes current status of an R&D program to develop a focusing system for the front end of a superconducting RF linac. Superconducting solenoids will be used as focusing lenses in the low energy accelerating sections of the front end. The development of focusing lenses for the first accelerating section is in the production stage, and lens certification activities are in preparation at FNAL. The report contains information about the focusing lens design and performance, including solenoid, dipole corrector, and power leads, and about cryogenic system design and performance. It also describes the lens magnetic axis position measurement technique and discusses scope of an acceptance/certification process.
Apollinari, G.; Carcagno, R.H.; Dimarco, J.; Huang, Y.; Kashikhin, V.V.; Orris, D.F.; Page, T.M.; Rabehl, R.; Sylvester, C.; Tartaglia, M.A.; Terechkine, I.; /Fermilab /Argonne
The SNS front-end, an injector for a high-power hydrogen-ion accelerator
The Spallation Neutron Source (SNS) will be an accelerator-based facility in Oak Ridge, TN, delivering pulsed neutron beams to experimenters. Negative hydrogen ion-beams are generated and pre-accelerated in a 2.5-MeV linac injector, or front end (FE), accelerated to 1 GeV energy by a linear accelerator system, converted into protons and accumulated in a ring accelerator, and then directed towards a mercury target to generate the neutrons. The proton beam arrives at the target in bursts of less than 1 {micro}s duration and with more than 1 MW average power. The front end has been built and commissioned by LBNL in Berkeley; shipment to ORNL is essentially complete. This paper provides an overview of FE major design features and experimental results obtained during the commissioning process. The SNS-FE can be viewed as a prototype of a high-current, high duty-factor injector for other accelerator projects or, without the elaborate MEBT, as an independent 2.5-MeV accelerator for various applications.
Keller, R.
the Front Line of Medicine to Prevent Needless Work Disability
Preparing the Front Line of Medicine to Prevent Needless Work Disability: Private 4. Free on-line CME; "Medical Rounds" in a talk show format 3. Free live;6 Approaches 1. Sessions at exis9ng medical educa9on events 2. Offer of on-line CME training
Front and backside processed thin film electronic devices
This invention provides methods for fabricating thin film electronic devices with both front- and backside processing capabilities. Using these methods, high temperature processing steps may be carried out during both frontside and backside processing. The methods are well-suited for fabricating back-gate and double-gate field effect transistors, double-sided bipolar transistors and 3D integrated circuits.
Yuan, Hao-Chih (Madison, WI); Wang, Guogong (Madison, WI); Eriksson, Mark A. (Madison, WI); Evans, Paul G. (Madison, WI); Lagally, Max G. (Madison, WI); Ma, Zhenqiang (Middleton, WI)
Mean Flow Evolution of a Baroclinically Unstable Potential Vorticity Front
Quasi-linear theory and numerical models are used to study the mean flow modification of a two-layer shallow water baroclinically unstable flow as a function of Rossby number. This flow has an upper-layer potential vorticity front overlying a ...
Emmanuel Boss; Lu Anne Thompson
Dynamics of Potential Vorticity Fronts and Eddy Detachment
The formation and detachment of quasi-geostrophic eddies in a 1� layer jet is studied using a piecewise uniform potential vorticity model. A vorticity front separates the two pieces, and thus the jet has cusplike character. The evolution of large ...
L. J. Pratt; Melvin E. Stern
(front end fuel cycle) 2.1 (CANDU
2 (front end fuel cycle) 2.1 (CANDU: CANada Deuterium Uranium; . ( 2.2) . 70-80% , (uranium concentrate) . () 2.1 . 2.2 2.3 #12; 2; . Mine Car Load Skip Geiger Counter 8"~3/2"" . (2
Hong, Deog Ki
Observation of Atmospheric Fronts Using Raman Lidar Moisture Measurements
This paper presents the results of a field program using a ground-based Raman lidar system to observe changes in moisture profiles as a cold and a warm front passed over the NASA/Goddard Space Flight Center in Greenbelt, Maryland. The lidar ...
S. H. Melfi; D. Whiteman; R. Ferrare
On the propagation of a coupled saturation and pressure front
Using an asymptotic technique, valid for a medium with smoothly varying heterogeneity, I derive an expression for the velocity of a propagating, coupled saturation and pressure front. Due to the nonlinearity of the governing equations, the velocity of the propagating front depends upon the magnitude of the saturation and pressure changes across the front in addition to the properties of the medium. Thus, the expression must be evaluated in conjunction with numerical reservoir simulation. The propagation of the two-phase front is governed by the background saturation distribution, the saturation-dependent component of the fluid mobility, the porosity, the permeability, the capillary pressure function, the medium compressibility, and the ratio of the slopes of the relative permeability curves. Numerical simulation of water injection into a porous layer saturated with a nonaqueous phase liquid indicates that two modes of propagation are important. The fastest mode of propagation is a pressure-dominated disturbance that travels through the saturated layer. This is followed, much later, by a coupled mode with a large saturation change. These two modes are also observed in a simulation using a heterogeneous porous layer. A comparison between the propagation times estimated from the results of the numerical simulation and predictions from the asymptotic expression indicates overall agreement.
Vasco, D. W.
Move-to-Front, Distance Coding, and Inversion Frequencies revisited
Move-to-Front, Distance Coding and Inversion Frequencies are three simple and effective techniques used to process the output of the Burrows-Wheeler Transform. In this paper we provide the first complete comparative analyses of these techniques, establishing ... Keywords: Burrows-Wheeler Transform, Data Compression, Empirical entropy
Travis Gagie; Giovanni Manzini
Benthic Observations on the Madeira Abyssal Plain: Fronts
Analysis of data from a mooring with five vector-averaging current meters between 10 and 70 m above the bed of the Madeira Abyssal Plain reveals the existence of narrow regions with relatively large gradients of potential temperature, or �fronts.�...
S. A. Thorpe
X-ray sources on next generation low emittance/high brilliance synchrotrons such as the 7-GeV Advanced Photon Source (APS) (1) have unique properties which directly affect the design of the front end of the beam line. The most striking of these are the large peak photon power densities
P. J. Viccaro
This invention provides thin film devices that have been processed on their front- and backside. The devices include an active layer that is sufficiently thin to be mechanically flexible. Examples of the devices include back-gate and double-gate field effect transistors, double-sided bipolar transistors and 3D integrated circuits.
Evans, Paul G. (Madison, WI); Lagally, Max G. (Madison, WI); Ma, Zhenqiang (Middleton, WI); Yuan, Hao-Chih (Lakewood, CO); Wang, Guogong (Madison, WI); Eriksson, Mark A. (Madison, WI)
Feature Stories | ORNL
News Releases News Releases Features 2014 2013 2012 2011 2010 Story Tips Audio Spots Honors and Awards Videos ORNL Review Magazine ORNL Reporter DOE Pulse Media Contacts Media Mentions RSS Feeds News Home | ORNL | News | Features Features ORNL's Office of Communications works with national, regional, and local media outlets on news stories about the laboratory. For more information on ORNL and its research and development activities, please refer to one of our Media Contacts. If you have a general media-related question or comment, you can send it to email@example.com. 1-25 of 25 Results Comprehensive phonon "map" offers direction for engineering new thermoelectric devices January 08, 2014 - If you've ever been stuck in traffic on a hot, sunny afternoon, you might have noticed the rippling effect caused by the release
Environment Feature Stories
Environment Feature Stories Environment Feature Stories /community-environment/_assets/images/icon_earthday.jpg Environment Feature Stories Our environmental stewardship commitment: we will clean up the past, minimize impacts for current environmental operations, and create a sustainable future. Piñon trees show increased susceptibility to drought when also subjected to rising temperatures. Rising global temperatures accelerate drought-induced forest mortality Many southwestern forests in the United States will disappear or be heavily altered by 2050, according to a series of joint LANL-UNM studies. - 7/10/13 Haze of smoke emanating from the 2011 Las Conchas, NM fire. Wildfires may contribute more to global warming than previously predicted They suggest that fire emissions could contribute a lot more to the
Summer Feature | .EDUconnections
Office of Scientific and Technical Information (OSTI)
Summer Feature Summer Feature U.S. DOE Office of Science Workforce Development for Teachers & Scientists WDTS plays a distinctive role in inspiring, engaging, and training the next generation of scientists, mathematicians, engineers, and technologists, in the science and technology mission of DOE. Albert Einstein Distinguished Educator Fellowship provides fellowships for elementary and secondary school mathematics and science teachers Brochure Graduate Student Awards for the Lindau Meeting of Nobel Laureates provides opportunity for U.S. doctoral students to travel to Lindau to participate in discussions with the Nobel Laureates 2011 Participants Community College Institute of Science and Technology (CCI) provides paid internships in science and engineering and technology
ACR-1000 Passive Features
The Advanced CANDU Reactor{sup TM} (ACR{sup TM}) is a Generation III+ pressure tube type reactor using light water coolant and heavy water moderator. The ACR-1000 reactor design is an evolutionary extension of the proven CANDU reactor design. The ACR-1000 incorporates multiple and diverse passive systems for accident mitigation. Where necessary, one or more features that are passive in nature have been included for mitigation of any postulated accident event. This paper describes how the use of passive design elements complements active features enhances reliability and improves safety margins. (authors)
Lekakh, Boris; Hau, Ken; Ford, Steven [Atomic Energy of Canada Ltd. (Canada)
Well-to-Wheels Energy Use and Greenhouse Gas Emissions of Plug-In Hybrid Electric Vehicles
Analyzed distribution of vehicles by last trip ending time for each region Generated PHEVs load profiles PSAT were adjusted to on-road values for this analysis PHEV miles driven by grid electricity and onWell-to-Wheels Energy Use and Greenhouse Gas Emissions of Plug-In Hybrid Electric Vehicles Amgad
Kinematic and Moisture Characteristics of a Nonprecipitating Cold Front Observed during IHOP. Part I: Across-Front Structures
A wide array of ground-based and airborne instrumentation is used to examine the kinematic and moisture characteristics of a nonprecipitating cold front observed in west-central Kansas on 10 June 2002 during the International H2O Project (IHOP). ...
Katja Friedrich; David E. Kingsmill; Cyrille Flamant; Hanne V. Murphey; Roger M. Wakimoto
Performance Study of ScepterTM Metal Bond Diamond Grinding Wheel
Advanced ceramics are attractive for many applications in the transportation, energy, military, and industrial markets because they possess properties of high-temperature durability, corrosion resistance, strength, hardness, stiffness, and wear resistance. Unfortunately, these same properties make advanced ceramics more difficult to machine than traditional materials. The reliability and manufacturing costs of advanced ceramic components are significant concerns that must be overcome. Nevertheless, the use of advanced ceramic materials is expected to increase dramatically in new transportation systems in response to more stringent energy conservation and pollution reduction requirements. This study discusses the goals, commercialization plans, phased development, scale-up, testing, and external verification of performance of the innovative grinding wheel that evolved from the project.
Denison, S.K.; Licht, R.W.; McSpadden, S.B., Jr.; Parten, R.J.; Picone, J.W.; Shelton, J.E.
Cosmological toolkit project featured on DOE energy website | Argonne
Cosmological toolkit project featured on DOE energy website Cosmological toolkit project featured on DOE energy website October 2, 2013 Tweet EmailPrint Researchers from Argonne National Laboratory, in partnership with Fermilab and Lawrence Berkeley National Laboratory, are developing a state-of-the-art toolkit for analyzing cosmological simulation data. The work was recently featured on the DOE website Energy.gov. Leading the Argonne team are Salman Habib, senior physicist and computational scientist in Argonne's High Energy Physics and Mathematics and Computer Science Divisions, and Ravi Madduri, project manager in the MCS Division. The multilaboratory team seeks to create an open platform with a web-based front end that will allow scientists to transfer, search, and analyze the complex data being generated by galaxy-formation simulations. Key to this
Radio frequency circuits for wireless receiver front-ends
The beginning of the 21st century sees great development and demands on wireless communication technologies. Wireless technologies, either based on a cable replacement or on a networked environment, penetrate our daily life more rapidly than ever. Low operational power, low cost, small form factor, and function diversity are the crucial requirements for a successful wireless product. The receiver??s front-end circuits play an important role in faithfully recovering the information transmitted through the wireless channel. Bluetooth is a short-range cable replacement wireless technology. A Bluetooth receiver architecture was proposed and designed using a pure CMOS process. The front-end of the receiver consists of a low noise ampli?er (LNA) and mixer. The intermediate frequency was chosen to be 2MHz to save battery power and alleviate the low frequency noise problem. A conventional LNA architecture was used for reliability. The mixer is a modi?ed Gilbert-cell using the current bleeding technique to further reduce the low frequency noise. The front-end draws 10 mA current from a 3 V power supply, has a 8.5 dB noise ?gure, and a voltage gain of 25 dB and -9 dBm IIP3. A front-end for dual-mode receiver is also designed to explore the capability of a multi-standard application. The two standards are IEEE 802.11b and Bluetooth. They work together making the wireless experience more exciting. The front-end is designed using BiCMOS technology and incorporating a direct conversion receiver architecture. A number of circuit techniques are used in the front-end design to achieve optimal results. It consumes 13.6 mA from a 2.5 V power supply with a 5.5 dB noise ?gure, 33 dB voltage gain and -13 dBm IIP3. Besides the system level contributions, intensive studies were carried out on the development of quality LNA circuits. Based on the multi-gated LNA structure, a CMOS LNA structure using bipolar transistors to provide linearization is proposed. This LNA con?guration can achieve comparable linearity to its CMOS multi-gated counterpart and work at a higher frequency with less power consumption. A LNA using an on-chip transformer source degeneration is proposed to realize input impedance matching. The possibility of a dual-band cellular application is studied. Finally, a study on ultra-wide band (UWB) LNA implementation is performed to explore the possibility and capability of CMOS technology on the latest UWB standard for multimedia applications.
Xin, Chunyu
News and Features
News and Features: News and Features: Oak Ridge Labor-Management Prayer Breakfast donates $6,000 to Steps House, Inc. The 16th annual Oak Ridge area prayer breakfast was held on December 5, 2014, at the Cokesbury Center on Kingston Pike in Knoxville. The event drew over 400 people who contributed $3,522 to the Steps House after hearing Patrick W. White, Founder and Chief Operating Officer speak about the history of the effort to help men who are in desperation and cannot obtain help elsewhere. From two houses to now 28 half-way type houses for these veterans and others who are at the bottom of their lives through drug and alcohol abuse or other similar difficulties, White told his compelling life story. The speaker donated his honorarium and the committee added sufficient
Fermilab | Recovery Act | Features
Features - Archive Features - Archive photo Industrial Building 3 addition Fermilab Today-November 5, 2010 IB3 addition nears completion The future site of Fermilabs new materials laboratory space has evolved from a steel outline to a fully enclosed building over the past five months. Read full column photo Fermilab Today-October 22, 2010 Recovery Act gives LBNE team chance to grow Thanks to funding from the American Recovery and Reinvestment Act, the collaboration for the Long-Baseline Neutrino Experiment, LBNE, has expanded its project team. Read full column photo cooling units Fermilab Today-October 15, 2010 Local company completes FCC roof construction A local construction company recently completed work on the roof of the Feynman Computing Center, an important step in an ongoing project funded by
Biofuels development in Maine: Using trees to oil the wheels of sustainability -Maine news, sports, obituaries, weather -Bangor Daily News http://bangordailynews.com/2013/03/12/opinion/biofuels-development-in-maine-using-trees-to-oil-the-wheels-of-sustain
Biofuels development in Maine: Using trees to oil the wheels of sustainability - Maine news, sports, obituaries, weather - Bangor Daily News http://bangordailynews.com/2013/03/12/opinion/biofuels-development-in-maine-using-trees-to-oil-the-wheels-of-sustainability/print/[3/13/2013 1:54:43 PM] Biofuels development
Thomas, Andrew
An Investigation of an Arctic Front with a Vertically Nested Mesoscale Model
A vertically mesoscale regional numerical weather prediction model is used to simulate an arctic front. The front was observed during the Arctic Cyclone Expedition of 1984. The regional model employs a unique vertical nesting scheme in which the ...
William T. Thompson; Stephen D. Burk
Cold Fronts with and without Prefrontal Wind Shifts in the Central United States
Time series of cold fronts from stations in the central United States possess incredible variety. For example, time series of some cold fronts exhibit a sharp temperature decrease coincident with a pressure trough and a distinct wind shift. Other ...
David M. Schultz
Episodic Dust Events of Utah�s Wasatch Front and Adjoining Region
Episodic dust events cause hazardous air quality along Utah�s Wasatch Front and dust loading of the snowpack in the adjacent Wasatch Mountains. This paper presents a climatology of episodic dust events of the Wasatch Front and adjoining region ...
W. James Steenburgh; Jeffrey D. Massey; Thomas H. Painter
The Development of the Piedmont Front and Associated Outbreak of Severe Weather on 13 March 1986
An investigation was conducted of the mesoscale evolution of a quasi-stationary front, termed the Piedmont front owing to its location through the central Carolinas, and an associated outbreak of severe weather on 13 March 1986. Space-time ...
Steven Businger; William H. Bauman III; Gerald F. Watson
Low-Frequency Variability in the Midlatitude Baroclinic Atmosphere Induced by an Oceanic Thermal Front
This study examines the flow induced by an east�west-oriented oceanic thermal front in a highly idealized baroclinic model. Previous work showed that thermal fronts could produce energetic midlatitude jets in an equivalent-barotropic atmosphere ...
Yizhak Feliks; Michael Ghil; Eric Simonnet
Two Types of Surface Wind Response to the East China Sea Kuroshio Front
Effects of the sea surface temperature (SST) front along the East China Sea Kuroshio on sea surface winds at different time scales are investigated. In winter and spring, the climatological vector wind is strongest on the SST front while the ...
Jing-Wu Liu; Su-Ping Zhang; Shang-Ping Xie
Mesoscale Subduction at the Antarctic Polar Front Driven by Baroclinic Instability
A study of mesoscale subduction at the Antarctic Polar Front (PF) is conducted by use of hydrographic data from a high-resolution, quasi-synoptic survey of the front. The geostrophic velocity and isopycnal potential vorticity (PV) fields are ...
Alberto C. Naveira Garabato; Harry Leach; John T. Allen; Raymond T. Pollard; Volker H. Strass
Front-end utility rate updates | OpenEI Community
Front-end utility rate updates Front-end utility rate updates Home > Groups > Utility Rate Rmckeel's picture Submitted by Rmckeel(297) Contributor 13 February, 2013 - 14:28 Utility Rates A few utility rate updates worth noting. We used to have a limit of 100 for results returned on the utility gateway. That has been increased, along with a few UI updates. There is now a 15em height window (sorry if that's too technical) to browse results, so all the hundreds of results don't extend the page. For the naming page however, perhaps the long list is preferred? I'm willing to tweak these heights, as well as have separate heights if it is requested for the public view and the editor view. Improvement to have results show within the block instead of outside of. Minor increase in results width on editor page.
Tracking thermal fronts with temperature-sensitive, chemically reactive tracers
Los Alamos is developing tracer techniques using reactive chemicals to track thermal fronts in fractured geothermal reservoirs. If a nonadsorbing tracer flowing from the injection to production well chemically reacts, its reaction rate will be a strong function of temperature. Thus the extent of chemical reaction will be greatest early in the lifetime of the system, and less as the thermal front progresses from the injection to production well. Early laboratory experiments identified tracers with chemical kinetics suitable for reservoirs in the temperature range of 75 to 100/sup 0/C. Recent kinetics studies have focused on the kinetics of hydrolysis of derivatives of bromobenzene. This class of reactions can be used in reservoirs ranging in temperature from 150 to 275/sup 0/C, which is of greater interest to the geothermal industry. Future studies will include laboratory adsorption experiments to identify possibly unwanted adsorption on granite, development of sensitive analytical techniques, and a field demonstration of the reactive tracer concept.
Robinson, B.A.; Birdsell, S.A.
Laser supported solid state absorption fronts in silica
We develop a model based on simulation and experiment that explains the behavior of solid-state laser-supported absorption fronts generated in fused silica during high intensity (up to 5GW/cm{sup 2}) laser exposure. We find that the absorption front velocity is constant in time and is nearly linear in laser intensity. Further, this model can explain the dependence of laser damage site size on these parameters. This behavior is driven principally by the temperature-activated deep sub band-gap optical absorptivity, free electron transport and thermal diffusion in defect-free silica for temperatures up to 15,000K and pressures < 15GPa. The regime of parameter space critical to this problem spans and extends that measured by other means. It serves as a platform for understanding general laser-matter interactions in dielectrics under a variety of conditions.
Carr, C W; Bude, J D
A turnstile mechanism for fronts propagating in fluid flows
We consider the propagation of fronts in a periodically driven flowing medium. It is shown that the progress of fronts in these systems may be mediated by a turnstile mechanism akin to that found in chaotic advection. We first define the modified ("active") turnstile lobes according to the evolution of point sources across a transport boundary. We then show that the lobe boundaries may be constructed from stable and unstable \\emph{burning invariant manifolds}---one-way barriers to front propagation analogous to traditional invariant manifolds for passive advection. Because the burning invariant manifolds (BIMs) are one-dimensional curves in a three-dimensional ($xy\\theta$) phase space, their projection into $xy$-space exhibits several key differences from their advective counterparts: (lobe) areas are not preserved, BIMs may self-intersect, and an intersection between stable and unstable BIMs does not map to another such intersection. These differences must be accommodated in the correct construction of the new turnstile. As an application, we consider a lobe-based treatment protocol for protecting an ocean bay from an invading algae bloom.
John R. Mahoney; Kevin A. Mitchell
GASLESS COMBUSTION FRONTS WITH HEAT LOSS ANNA GHAZARYAN, STEPHEN SCHECTER, AND PETER L. SIMON Abstract. For a model of gasless combustion with heat loss, we use geometric singular perturbation theory to show existence of traveling combustion fronts. We show that the fronts are nonlinearly stable
Towards front-tracking based on conservation in two space dimensions III, tracking interfaces
This is the third paper in the series of our conservative front-tracking method. In this paper, we describe how our method tracks fluid interfaces in multi-fluid flows. Two important ingredients in our conservative front-tracking method in tracking fluid ... Keywords: Conservative front-tracking, Fluid interface, Numerical surface dissipation, Velocity and pressure equilibrium
Mohammed Aman Ullah, Wenbin Gao, De-Kang Mao
Analysis of a Surface Front during the Early Summer Rainy Season over Taiwan
A case study of a relatively dry front during TAMEX IOP-4 is presented. At 0000 UTC 27 May, the broad cloud band extended from the China plain and southern Japan to east of 150�E, along and north of the surface front. This front possessed ...
Yi-Leng Chen; Yu-Xia Zhang; Norman B-F. Hui
Occluded Fronts and the Occlusion Process: A Fresh Look at Conventional Wisdom
Traditionally, the formation of an occluded front during the occlusion process in extratropical cyclones has been viewed as the catch-up of a faster-moving cold front to a slower-moving warm front separating the warm-sector air from the low center, as ...
David M. Schultz; Geraint Vaughan
The Sandia Hand Features
Sandia Hand Sandia Hand Features Low Cost: using 3D high-resolution rapid prototyping technologies for low volumes, ensuring each component is amenable to injection molding for high volumes, and designing around components found in large consumer markets has enabled significant cost reductions Dexterous: designed with four 3 Degree of Freedom (DOF) fingers to enable dexterous tasks such as finger gating while still maintaining form closure Modular: a hand frame with identical finger modules that attach through magnetic attachment with electrical power and communications achieved through spring contacts. Power to each finger socket is actively controlled, permitting hot swapping of finger modules. Benefits
Well-to-Wheels Energy Use and Greenhouse Gas Emissions of Well-to-Wheels Energy Use and Greenhouse Gas Emissions of Plug-In Hybrid Electric Vehicles Amgad Elgowainy and Michael Wang Center for Transportation Research Argonne National Laboratory LDV Workshop July26, 2010 2 2 2 Team Members 2 ANL's Energy Systems (ES) Division Michael Wang (team leader) Dan Santini Anant Vyas Amgad Elgowainy Jeongwoo Han Aymeric Rousseau ANL's Decision and Information Sciences (DIS) Division: Guenter Conzelmann Leslie Poch Vladimir Koritarov Matt Mahalik Thomas Veselka Audun Botterud Jianhui Wang Jason Wang 3 3 3 Scope of Argonne's PHEV WTW Analysis: Vehicle Powertrain Systems and Fuel Pathways 3 Vehicle powertrain systems: Conventional international combustion engine vehicles (ICEVs)
Process demonstration and cost analysis of a mass production forging technique for automotive turbine wheels: Phase II. Final report, January 1975--March 1977
Low cost fabrication of integrally-bladed automotive turbine wheels utilizing the GATORIZING forging process was demonstrated. The capability of the forging process was characterized as to blade shape, and the effect of the blade shape on Chrysler baseline engine turbine efficiency was analytically defined. Actual baseline engine turbine wheels were fabricated from IN100 and AF2-1DA for evaluation. A mass production cost estimate was generated for manufacturing large production quantities.
Allen, M.M.; Larson, K.J.; Walker, B.H.
Effects of curvature and compressibility on the stability of thermal fronts
The stability of subsonic thermal fronts against corrugation is analyzed and an exact dispersion relation is obtained taking into account the effects of the curvature of the distorted front as well as the compressibility of the gas. At a certain value of the Mach number ahead of the thermal front, unstable rates show a maximum; these rates drop to zero when a Chapman-Jouguet regime is established behind heat fronts. It is shown that curvature effects tend to stabilize conductive heat fronts propagating in a compressible gas.
Ibanez S, Miguel H.; Bessega L, Maria C.; Shchekinov, Yuri [Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de los Andes, Apartado 26, Ipostel, La Hechicera, Merida (Venezuela); Centro de Fisica Teorica y Computacional, Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela); Department of Physics, University of Rostov, Rostov on Don, 34409 (Russian Federation)
Hopper Featured Announcements
Announcements Announcements Hopper Featured Announcements Hopper OS upgrade and new SW set to default next Wed, Feb 27 February 21, 2013 by Helen He | 0 Comments 1) There will be a scheduled hardware and software maintenance for Hopper next Wednesday, February 27, from 7 am to 7 pm Pacific time. This is a major OS upgrade. Most applications are highly recommended to recompile (or at least relink) after the maintenance. C++ and PGAS applications are recommended to recompile and relink. Please plan your work accordingly and check the NERSC Message of the Day (MOTD) for status update: http://www.nersc.gov/live-status/motd/. 2) After the maintenance, the following software versions will be set to default on Hopper: -- pgi/12.9.0 -- gcc/4.7.2 -- cce/8.1.3 -- intel/18.104.22.168
NETL: Features - December 2009
9 9 Extreme Drilling Laboratory Is Ready to Rock and Roll The Extreme Drilling Laboratory The Extreme Drilling Laboratory is located at the NETL Morgantown site. Initial research operations will begin in 2010. The Extreme Drilling Laboratory (XDL) at the National Energy Technology Laboratory (NETL) proudly announces the much-anticipated debut of its prototype Ultra-deep Drilling Simulator (UDS), the rock star of the XDL. Drilling research will begin soon at an experimental well site with pressures reaching 30,000 pounds of force per square inch and temperatures exceeding 480 °F at the bottom of the well. One of the many unique features of this extreme drilling research is that 100 percent of the drilling will occur above ground. In addition, the UDS operating pressure
Salient Biological Features, Systematics,
Salient Salient Biological Features, Systematics, and Genetic Variation of Populus Gancho T. Slavov and Peter Zhelev Abstract The genus Populus includes morphologically diverse species of decid- uous, relatively short-lived, and fast-growing trees. Most species have wide ranges of distribution but tend to occur primarily in riparian or mountainous habitats. Trees from this genus are typically dioecious, flower before leaf emer- gence, and produce large amounts of wind-dispersed pollen or seeds. Seedlings are drought- and shade-intolerant, and their establishment depends on distur- bance and high soil moisture. Asexual reproduction is common and occurs via root sprouting and/or rooting of shoots. Fossil records suggest that the genus appeared in the late Paleocene or early Eocene (i.e., 50-60 million years BP). According to one commonly used classification, the genus is comprised
Numerical investigation of the grinding process in a Beater Wheel mill with classifier
A numerical investigation is presented for a two-dimensional simulation of the gas flow field and of the dynamic behavior of lignite particles inside Beater Wheel mills with classifier, installed in large coal-fired plants. A large number of representative particles are tracked using Lagrangian equations of motion, in combination with a stochastic model for particle turbulent dispersion. All the important mechanisms associated with the particle motion through the mill (particle-surface collisions and rebounding phenomena, fuel moisture evaporation and erosion wear of internal surfaces) are modeled. A special model is constructed to simulate the fragmentation of impacting particles and to calculate the size distribution of the final mill product. The models are regulated on the basis of available data from grinding mills of the Greek lignite power stations. The numerical code is capable of predicting the locations of significant erosion and to estimate the amount of particle mass that circulates through the mill via the classifying chamber. Mean impact velocity and impingement angle distributions along all the internal surfaces are also provided. The results indicate remarkable differences in the extent of the erosion caused at different locations of the mill. Also, the significant role of the leading blades arrangement inside the classifier on its classification performance and efficiency is elucidated.
Anagnostopoulos, J.; Bergeles, G. [National Technical Univ. of Athens (Greece)
Outdoor Air, Heat Wheels and JCPenney: A New Approach to Retail Ventilation
JCPenney Construction Services department is responsible for the construction of new stores, takeover of existing facilities to create a new store, repairs to existing JCPenney facilities and the expansion and modernization of stores across the nation and the world. Each year, JCPenney Construction Services handles approximately 50 projects along these lines. After the implementation of ASHRAE 62- 1989 by JCPenney and many major building codes, including BOCA, mechanical engineers at JCPenney noticed a sharp increase in the percentage of cooling capacity required to cool the outdoor ventilation air. In an effort to limit this impact, both in first cost and in operational costs, JCPenney is beginning to make an effort to use enthalpy heat wheels in the hot and humid climate areas where it is economically feasible. This paper discusses the efforts of JCPenney to implement this option to the treatment of outdoor air in a store in Baton Rouge, LA while maintaining indoor air quality requirements as stated in ASHRAE Standard 62-1989 and maintaining energy efficiency. This paper also discusses the projected energy savings and operations of this alternative to the standard treatment of outdoor air.
Smith, C. S.; Bartlett, T. A.
Instrument Front-Ends at Fermilab During Run II
The optimization of an accelerator relies on the ability to monitor the behavior of the beam in an intelligent and timely fashion. The use of processor-driven front-ends allowed for the deployment of smart systems in the field for improved data collection and analysis during Run II. This paper describes the implementation of the two main systems used: National Instruments LabVIEW running on PCs, and WindRiver's VxWorks real-time operating system running in a VME crate processor.
Meyer, Thomas; Slimmer, David; Voy, Duane; /Fermilab
Protective coatings for front surface reflectors. Phase I, final report
Silicone resins were evaluated as protective coatings for front surface aluminum and silver reflectors. The solar weighted hemispherical reflectances and specular reflectances of float glass squares metallized with silver and aluminum and protected with silicone coatings were measured. The float glass squares metallized with silver and aluminum were highly reflective. The total reflectances of the silver samples were 5 to 7% higher than the aluminized samples. The resin coated aluminum samples were much more specular than the silver samples. Coupling agents used to improve the adhesion of the protective silicone resin coating to the silver surface adversely affected the specularities.
Dennis, W.E.
Multilayer coatings for the EUVL front-end test bed
Good illumination uniformity at the mask and wafer planes, and high wafer thoroughput in the EUVL front-end test bed facility at LLNL require graded period multilayer (ML) coatings on several of the optics. The ML deposition was accomplished using a newly developed deposition technique which avoids the use of {open_quotes}uniformity masks{close_quotes} to define the spatial dependence of the ML period variation. The capabilities of the process in providing the specified ML coatings are discussed for both EUVL condenser and imaging systems.
Vernon, S.P.; Carey, M.J.; Gaines, D.P.; Weber, F.J.
Energy Loss at Propagating Jamming Fronts in Granular Gas Clusters
We explore the initial moments of impact between two dense granular clusters in a two-dimensional geometry. The particles are composed of solid CO$_{2}$ and are levitated on a hot surface. Upon collision, the propagation of a dynamic "jamming front" produces a distinct regime for energy dissipation in a granular gas in which the translational kinetic energy decreases by over 90%. Experiments and associated simulations show that the initial loss of kinetic energy obeys a power law in time, $\\Delta E=-Kt^{3/2}$, a form that can be predicted from kinetic arguments.
Justin C. Burton; Peter Y. Lu; Sidney R. Nagel
Light-Front Holography and QCD Hadronization at the Amplitude Level
Light-front holography allows hadronic amplitudes in the AdS/QCD fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The AdS coordinate z is identified with an invariant light-front coordinate zeta which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schrodinger equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. A new method for computing the hadronization of quark and gluon jets at the amplitude level using AdS/QCD light-front wavefunctions is outlined.
Stanley J. Brodsky; Guy de Teramond
Evolutionary algorithm for the neutrino factory front end design
The Neutrino Factory is an important tool in the long-term neutrino physics program. Substantial effort is put internationally into designing this facility in order to achieve desired performance within the allotted budget. This accelerator is a secondary beam machine: neutrinos are produced by means of the decay of muons. Muons, in turn, are produced by the decay of pions, produced by hitting the target by a beam of accelerated protons suitable for acceleration. Due to the physics of this process, extra conditioning of the pion beam coming from the target is needed in order to effectively perform subsequent acceleration. The subsystem of the Neutrino Factory that performs this conditioning is called Front End, its main performance characteristic is the number of the produced muons.
Poklonskiy, Alexey A.; /Michigan State U.; Neuffer, David; /Fermilab
Commissioning of the SNS front-end systems at Berkeley Lab
COMMISSIONING OF THE SNS FRONT-END SYSTEMS AT BERKELEY LAB*Details of other MEBT commissioning efforts, especiallywere provided by LANL. Commissioning topics included beam
Front Row (left to right): Bryan Reed, Wayne King, Nigel Browning ...
DTEM � Team Members: Front Row (left to right): Bryan Reed, Wayne King, Nigel Browning, Judy Kim, Michael Armstrong Back Row (left to right): Thomas LaGrange ...
Factors controlling streambed coverage of Didymosphenia geminata in two regulated streams in the Colorado Front Range
of dissolved substances from a Colorado mountain watershed.11: CDOT, 2009. Colorado Department of Transportation.two regulated streams in the Colorado Front Range Matthew P.
Miller, Matthew P.; McKnight, Diane M.; Cullis, James D.; Greene, Alicia; Vietti, Kristin; Liptzin, Daniel
Recursion relations and scattering amplitudes in the light-front formalism
The fragmentation functions and scattering amplitudes are investigated in the framework of light-front perturbation theory. It is demonstrated that, the factorization property of the fragmentation functions implies the recursion relations for the off-shell scattering amplitudes which are light-front analogs of the Berends-Giele relations. These recursion relations on the light-front can be solved exactly by induction and it is shown that the expressions for the off-shell light-front amplitudes are represented as a linear combinations of the on-shell amplitudes. By putting external particles on-shell we recover the scattering amplitudes previously derived in the literature.
Christian A. Cruz-Santiago; Anna M. Stasto
Diminutive Frontal Waves�A Link between Fronts and Cyclones
A number of recent publications have dealt with cyclone identification and tracking. Following on, this paper extends the typical cyclone life cycle back in time to embrace a new feature called a �diminutive frontal wave.� One aim is to improve ...
Tim D. Hewson
ARM - Features and Releases Archive
CenterFeaturesFeatures and Releases Archive CenterFeaturesFeatures and Releases Archive Media Contact Lynne Roeder lynne-dot-roeder-at-pnnl-dot-gov @armnewsteam Field Notes Blog Topics Field Notes89 AGU 3 AMIE 10 ARM Aerial Facility 2 ARM Mobile Facility 1 6 ARM Mobile Facility 2 47 BAECC 1 BBOP 4 MAGIC 12 MC3E 17 SGP 2 STORMVEX 29 TCAP 3 Search News Search Blog News Center All Categories What's this? Social Media Guidance News Center All Categories Features and Releases Facility News Field Notes Blog feed Events feed Employment Research Highlights Data Announcements Education News Archive What's this? Social Media Guidance Features and Releases Archive 2013 Dec 30 Pole Position: New Field Campaigns Explore Arctic and Antarctic Atmosphere Nov 13 Research Flights Completed for Biomass Burning Field Campaign Nov 07 MAGIC Takes a Bow
Impacts of a Supersonic Shock Front on Star Formation in the Bullet Cluster
We use the Bullet Cluster (1E0657-56) to investigate the extent to which star formation in cluster galaxies is influenced by ram pressure from supersonic gas (Mach 3) during a cluster merger. While the effects of ram pressure have been studied for individual galaxies infalling into galaxy clusters, this system provides a unique opportunity to investigate the impact of dramatic merger events on the cluster galaxy population. In this analysis we use {\\it Spitzer} IRAC data to study star formation. At the redshift of the cluster the 6.2 $\\mu$m PAH feature is redshifted into the 8 $\\mu$m band, enabling use of the m$_{4.5}$-m$_{8}$ color as a proxy for specific star formation rate. We find that the color distribution on the two sides of the shock differ by less than 2$\\sigma$, and conclude that ram pressure from the shock front has no dramatic, immediate impact on the star formation of cluster galaxies in the Bullet Cluster.
Sun Mi Chung; Anthony H. Gonzalez; Douglas Clowe; Dennis Zaritsky; Maxim Markevitch; Christine Jones
Chung, Sun Mi; Clowe, Douglas; Zaritsky, Dennis; Markevitch, Maxim; Jones, Christine
Analysis of the Energy-Saving Potential of a Three-Rotary Wheel Fresh Air-Handling Unit
To evaluate the energy-saving potential of a proposed three-rotary wheel fresh air-handling unit (TRWFAHU), it is numerically simulated with weather data of Changsha by using a mathematical model. Compared with a conventional fresh air-handling unit, TRWFAHU can save 10.2% of primary energy and greatly decrease the energy consumption of chiller. If waste heat is available for regenerating the desiccant, the system can achieve greater energy savings. It is feasible to improve indoor air quality (IAQ) by increasing ventilation while without increasing energy consumption.
Hao, X.; Zhang, G.; Zou, S.; Liu, H.
Topographic Features | Open Energy Information
No definition has been provided for this term. Add a Definition Topography is the shape and arrangement of physical features on a surface. In the case of geothermal...
Argonne Transportation - 2007 Features Archive
7 Features Archive Argonne's Lithium-Ion Battery Technology Offers Reliability, Greater Safety Argonne's an internationally recognized leader in the development of lithium-battery...
DOE software featured at ESTSC
DOE software featured at ESTSC Multi AdminSystem Tracking-Environment Resource: MASTER is an open-source software package available from the Pacific Northwest National Laboratory...
Argonne Transportation - 2002 Features Archive
2 Features Archive Argonne Completes Evaluation of DOE Fuel Cell System Argonne National Laboratory has finished testing the U.S. Department of Energys (DOE's) first...
Bayesian Nonparametric Latent Feature Models
3 Bayesian Nonparametric Latent Feature Model Inference5 Non-exchangeable Bayesian Nonparametric Inferencefor Non-exchangeable Bayesian Nonparametric Latent ture
Miller, Kurt Tadayuki
The Interruption of Alpine Foehn by a Cold Front. Part I: Observations
in Inn and Wipp Valley Temperature slope profile Doppler wind lidar in Wipp Valley #12;6 of 13 Case study study Wipp Valley: AWS network Pot. Temp. and Wind Hovmoeller diagram Strong and warm foehn in the lower Wipp Valley Western Inn-Valley gust front enters Wipp Valley Cold front propagates southward
Gohm, Alexander
Trapping of a Coastal Density Front by the Bottom Boundary Layer
The dynamics of a surface-to-bottom density front on a uniformly sloping continental shelf and the role of density advection in the bottom boundary layer are examined using a three-dimensional, primitive equation numerical model. The front is ...
David C. Chapman; Steven J. Lentz
Fronts Formed by Obliquely Reflecting Internal Waves at a Sloping Boundary
A characteristic of internal waves reflecting from sloping boundaries is that they form fronts that travel with the component of the phase speed of the waves up the boundary. The strength of the fronts is assessed by estimating the magnitude of ...
Large-Scale Response of the Pacific Ocean Subarctic Front to Momentum Transfer: A Numerical Study
A numerical four-layer hydrodynamical model is implemented to investigate the role the atmosphere exerts on the dynamics of the subarctic front. While the effect of the westerly winds causes a southward shift of the front, the effect of a ...
Alejandro Camerlengo
The Linac Front End Test Stand (LFETS) was installed at the Source Development Laboratory (SDL) in the fall of 2011 in order to test the Linac Front End. The goal of these tests was to test the electron source against the specifications of the linac. In this report, we discuss the results of these measurements and the effect on linac performance.
Fliller R. P.; Gao, F.; Yang, X.; Rose, J.; Shaftan, T.; Piel, C
Discrete Event Front-tracking Simulation of a Physical Fire-spread Model
Simulation of moving interfaces such as a fire front usually requires resolution of a large-scale and detailed domain. Such computing involves the use of supercomputers to process the large amount of data and calculations. This limitation is mainly due ... Keywords: DEVS, asynchronous, discrete events, envelope, fire spread, flame, forest, front tracking, interface, simulation
Jean-Baptiste Filippi; Fr�d�ric Morandini; Jacques Henri Balbi; David Rc Hill
Effects of the sea surface temperature (SST) front along the East China Sea Kuroshio on sea surface winds at different time scales are investigated. In winter and spring, the climatological vector wind is strongest right on the SST front while the ...
Electrical double layers at shock fronts in glow discharges and afterglows
This paper examines the propagation of spark-generated shockwaves (1.0front in these weakly-ionized, nonmagnetized, collisional plasmas. We used a microwave hairpin resonator to measure the electron number density, and, for all cases, we measured an increase in the electron number density at the shock front. By comparing the increase in electron number density at the shock front in the active discharge and in the afterglow, we conclude that electrons with a temperature much greater than room temperature can be compressed at the shock front. The ratio of electron number density before and after the shock front can be approximately predicted using the Rankine-Hugoniot relationship. The large gradient in electron density, and hence a large gradient in the flux of charged species, created a region of space-charge separation, i.e., a double layer, at the shock front. The double layer balances the flux of charged particles on both sides of the shock front. The double layer voltage drop was measured in the current-carrying discharge using floating probes and compared with previous models. As well, we measured argon 1s{sup 5} metastable-state density and demonstrate that metastable-state neutral species can be compressed across a shock front and approximately predicted using the Rankine-Hugoniot relationship.
Siefert, Nicholas S. [Air Force Research Laboratory, Wright Patterson, Ohio 45433 (United States)
Finescale Vertical Structure of a Cold Front as Revealed by an Airborne Doppler Radar
In the afternoon of 24 May 2002, a well-defined and frontogenetic cold front moved through the Texas panhandle. Detailed observations from a series of platforms were collected near the triple point between this cold front and a dryline boundary.
Bart Geerts; Rick Damiani; Samuel Haimov
Higher-order differencing for phase-front propagation in geothermal systems
We are testing higher-order differencing total variation diminishing schemes implemented in the reservoir simulator TOUGH2 to reduce numerical dispersion of phase fronts in geothermal flow problems. The schemes are called total variation diminishing because they employ flux limiters to prevent spurious oscillations that sometimes occur with other higher-order differencing schemes near sharp fronts. Thus it appears that total variation diminishing schemes rely on an implicit assumption that the overall variability of advected quantities stays constant or diminishes with time. We use the Leonard total variation diminishing scheme in two special problems designed to test the applicability of the scheme for cases where this implicit assumption is violated. In the first problem, we investigate the isothermal propagation of a phase front in a composite porous medium where phase saturation increases as the front enters the second medium. In the second problem, we investigate the propagation of a phase front where boiling increases the saturation difference across the front as it propagates. In the composite porous medium problem, we find that spurious phase saturations can arise if the weighting scheme is based on relative permeability; for weighting based on phase saturation, no such oscillation arises. In the boiling front propagation problem, the front position is highly sensitive to weighting scheme, and the Leonard total variation diminishing scheme is more accurate than upstream weighting because it decreases numerical dispersion in the thermal energy equation.
Oldenburg, Curtis; Pruess, Karsten
Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW China
Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW, People's Republic of China c Northwest Institute of Uranium Geology, China National Nuclear Corporation, Wuyiyi and Shihongtan sandstone-hosted roll-front uranium deposits, northwest China. The mineralization
Fayek, Mostafa
Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China
Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern Available online 25 January 2005 Abstract We show evidence that the primary uranium minerals, uraninite-front uranium deposits, Xinjiang, northwestern China were biogenically precipitated and psuedomorphically
Real-Time Detection of Split Fronts Using Mesoscale Models and WSR-88D Radar Products
A structured methodology for detecting the presence of split cold fronts in an operational forecast environment is developed and applied to a case in which a split front passed over a region of cold air damming in the southeastern United States. ...
Steven E. Koch
Silicon Solar Cells with Front Hetero-contact and Aluminum Alloy Back Junction (Poster)
The objectives of this report are: (1) to apply industrial back Al process in efficient n-wafer cells with a-Si:H front surface passivation; and (2) to evaluate the surface recombination velocity (SRV) of the a-Si:H passivated front surface with different surface preparation procedures.
Yuan, H.-C.; Page, M. R.; Iwaniczko, E.; Xu, Y.; Roybal, L.; Wang, Q.; Branz, H. M.; Meier, D. L.
A front-tracking method for computation of interfacial flows with soluble surfactants
A finite-difference/front-tracking method is developed for computations of interfacial flows with soluble surfactants. The method is designed to solve the evolution equations of the interfacial and bulk surfactant concentrations together with the incompressible ... Keywords: Buoyancy-driven flow, Drop cleavage, Front-tracking method, Soluble surfactant
Metin Muradoglu; Gretar Tryggvason
Explains Vehicle Technologies to Illinois Companies and Government Explains Vehicle Technologies to Illinois Companies and Government Illinois chamber of commerce Attendees lined up for the test drive opportunities. On August 16, 2011, Argonne participated in the event, "Taking the Future Out for a Spin," organized by the Illinois Chamber of Commerce and held at the Autobahn Racing Country Club in Joliet, Il. Argonne researchers Glenn Keller and Henning Lohse-Busch were on hand to help attendees understand the advanced technology vehicles at the event. Lohse-Busch gave a presentation titled, "Current and Future Trends in Alternative Fuel Vehicles: A Research Perspective." Folks attending had the opportunity to drive a variety of advanced hybrid cars, including plug-in hybrids, electric vehicles and natural gas vehicles around a one and one-half mile closed racing course. Car manufacturers Chevy, Nissan, Tesla, Think, Mitsubishi and Ford provided electric vehicles, including the Chevy Volt and Nissan Leaf. Hybrid vehicles were provided by Toyota, Porsche, Kia, Cadillac and Ford. Chevy, VPG, Green Alternative Systems and Freightliner provided vehicles that run on compressed natural gas.
Engineers (SAE) Hybrid Task Force Committee. Harper's current research involves power line communication technology (PLC) and plug-in electric vehicle (PEV) communication...
Newsletter Features | Department of Energy
About Us » News & Blog » Newsletter Features About Us » News & Blog » Newsletter Features Newsletter Features Below are featured articles from the Indian Energy Beat newsletter. Download full issues of the newsletter. September 6, 2013 The Eastern Band of Cherokee Indians and the Mississippi Band of Choctaw Indians are converting waste vegetable oil and grease to biofuel in an effort to reduce the environmental impact of their energy use. Fuel from Waste Helps Power Two Tribes The Eastern Band of Cherokee Indians and the Mississippi Band of Choctaw Indians had plenty of used vegetable oil and grease on hand and a desire to convert the waste to biofuel to reduce the environmental impact of their energy use. The Tribes participated in a demonstration project with the intent to share their experience and lessons learned so that other Tribes
Nature Climate Change features Los
Nature Climate Change features Los Alamos forest research February 27, 2013 New print edition of journal tags tree-stress project for cover story LOS ALAMOS, N.M., Feb. 27,...
Argonne Transportation - 2006 Features Archive
6 Features Archive SAE International Environmental Excellence in Transportation (E2T) Award Runner-Up Michael Wang of Argonne National Laboratory was honored as a runner-up in the...
Feature-guided image stippling
This paper presents an automatic method for producing stipple renderings from photographs, following the style of professional hedcut illustrations. For effective depiction of image features, we introduce a novel dot placement algorithm which adapts ...
Dongyeon Kim; Minjung Son; Yunjin Lee; Henry Kang; Seungyong Lee
Static behaviour of an advanced ultra-light sandwich composite structure for a wheel chair
A theoretical approach of an ultra lightweight sandwich composite structure with extreme rigidity is presented. The structure features two carbon/epoxy skins reinforced with twill weave fabric, and an expanded polystyrene (EPS) core. The structure is ... Keywords: carbon/epoxy skins, expanded polystyrene core, sandwich structure, twill weave fabric
Florin Teodorescu; Condurache Dumitru; Grigore Stanca; Valeriu Avramescu; Raluca Magdalena Nita
Well-to-wheels analysis of fast pyrolysis pathways with the GREET model.
The pyrolysis of biomass can help produce liquid transportation fuels with properties similar to those of petroleum gasoline and diesel fuel. Argonne National Laboratory conducted a life-cycle (i.e., well-to-wheels [WTW]) analysis of various pyrolysis pathways by expanding and employing the Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) model. The WTW energy use and greenhouse gas (GHG) emissions from the pyrolysis pathways were compared with those from the baseline petroleum gasoline and diesel pathways. Various pyrolysis pathway scenarios with a wide variety of possible hydrogen sources, liquid fuel yields, and co-product application and treatment methods were considered. At one extreme, when hydrogen is produced from natural gas and when bio-char is used for process energy needs, the pyrolysis-based liquid fuel yield is high (32% of the dry mass of biomass input). The reductions in WTW fossil energy use and GHG emissions relative to those that occur when baseline petroleum fuels are used, however, is modest, at 50% and 51%, respectively, on a per unit of fuel energy basis. At the other extreme, when hydrogen is produced internally via reforming of pyrolysis oil and when bio-char is sequestered in soil applications, the pyrolysis-based liquid fuel yield is low (15% of the dry mass of biomass input), but the reductions in WTW fossil energy use and GHG emissions are large, at 79% and 96%, respectively, relative to those that occur when baseline petroleum fuels are used. The petroleum energy use in all scenarios was restricted to biomass collection and transportation activities, which resulted in a reduction in WTW petroleum energy use of 92-95% relative to that found when baseline petroleum fuels are used. Internal hydrogen production (i.e., via reforming of pyrolysis oil) significantly reduces fossil fuel use and GHG emissions because the hydrogen from fuel gas or pyrolysis oil (renewable sources) displaces that from fossil fuel natural gas and the amount of fossil natural gas used for hydrogen production is reduced; however, internal hydrogen production also reduces the potential petroleum energy savings (per unit of biomass input basis) because the fuel yield declines dramatically. Typically, a process that has a greater liquid fuel yield results in larger petroleum savings per unit of biomass input but a smaller reduction in life-cycle GHG emissions. Sequestration of the large amount of bio-char co-product (e.g., in soil applications) provides a significant carbon dioxide credit, while electricity generation from bio-char combustion provides a large energy credit. The WTW energy and GHG emissions benefits observed when a pyrolysis oil refinery was integrated with a pyrolysis reactor were small when compared with those that occur when pyrolysis oil is distributed to a distant refinery, since the activities associated with transporting the oil between the pyrolysis reactors and refineries have a smaller energy and emissions footprint than do other activities in the pyrolysis pathway.
Han, J.; Elgowainy, A.; Palou-Rivera, I.; Dunn, J.B.; Wang, M.Q. (Energy Systems)
A Simple Model of the Formation and Maintenance of the Shelf/Slope Front in the Middle Atlantic Bight
The strong salinity and temperature gradients across the shelf/slope front in the Middle Atlantic Bight often compensate such that the cross-front density gradient is nearly eliminated. The suggests that the density field may not be as ...
David C. Chapman
Observations of the Sea-Breeze Front during CaPE. Part II: Dual-Doppler and Aircraft Analysis
The three-dimensional kinematic structures of offshore and onshore flow sea-breeze fronts observed during the CaPE experiment are shown using high resolution dual-Doppler and aircraft data. The fronts interact with horizontal convective rolls (...
Nolan T. Atkins; Roger M. Wakimoto; Tammy M. Weckwerth
SiGe receiver front ends and flip-chip integrated wideband antennas for millimeter-wave passive imaging
SiGe wideband 77-GHz and 94-GHz front end receivers with integrated antennas for passive imaging have been designed and characterized. These front end systems exhibit wideband performance with the highest gain and lowest ...
Powell, Johnna, 1980-
Microscopic Examination of a Corrosion Front in Spent Nuclear Fuel
Spent uranium oxide nuclear fuel hosts a variety of trace chemical constituents, many of which must be sequestered from the biosphere during fuel storage and disposal. In this paper we present synchrotron x-ray absorption spectroscopy and microscopy findings that illuminate the resultant local chemistry of neptunium and plutonium within spent uranium oxide nuclear fuel before and after corrosive alteration in an air-saturated aqueous environment. We find the plutonium and neptunium in unaltered spent fuel to have a +4 oxidation state and an environment consistent with solid-solution in the UO{sub 2} matrix. During corrosion in an air-saturated aqueous environment, the uranium matrix is converted to uranyl U(VI)O{sub 2}{sup 2+} mineral assemblage that is depleted in plutonium and neptunium relative to the parent fuel. At the corrosion front interface between intact fuel and the uranyl-mineral corrosion layer, we find evidence of a thin ({approx}20 micrometer) layer that is enriched in plutonium and neptunium within a predominantly U{sup 4+} environment. Available data for the standard reduction potentials for NpO{sup 2+}/Np{sup 4+} and UO{sub 2}{sup 2+}/U{sup 4+} couples indicate that Np(IV) may not be effectively oxidized to Np(V) at the corrosion potentials of uranium dioxide spent nuclear fuel in air-saturated aqueous solutions. Neptunium is an important radionuclide in dose contribution according to performance assessment models of the proposed U. S. repository at Yucca Mountain, Nevada. A scientific understanding of how the UO{sub 2} matrix of spent nuclear fuel impacts the oxidative dissolution and reductive precipitation of neptunium is needed to predict its behavior at the fuel surface during aqueous corrosion. Neptunium would most likely be transported as aqueous Np(V) species, but for this to occur it must first be oxidized from the Np(IV) state found within the parent spent nuclear fuel [1]. In the immediate vicinity of the spent fuel's surface the redox and nucleation behavior is likely to promote/enhance nucleation of NpO{sub 2} and Np{sub 2}O{sub 5}. Alternatively, Np may be incorporated into uranyl (UO{sub 2}{sup 2+}) alteration phases [2]. In some cases, less-soluble elements such as plutonium will be enriched near the surface of the corroding fuel [3]. We have used focused synchrotron x-rays from the MRCAT beam line at the Advanced Photon Source (APS) at Argonne National Lab to examine a specimen of spent nuclear fuel that had been subject to 10 years of corrosion testing in an environment of humid air and dripping groundwater at 90 C [4]. We find evidence of a region, approximately 20 microns in thickness, enriched in plutonium and neptunium at the corrosion front that exists between the uranyl silicate alteration mineral rind and the unaltered uranium oxide fuel (Figures 1 and 2). The uranyl silicate is itself found to be depleted in these transuranic elements relative to their abundance relative to uranium in the parent fuel. This suggests a low mobility of these components owing to a resistance to oxidize further in the presence of a UO{sub 2}{sup 2+}/U{sup 4+} couple [5].
J.A> Fortner; A.J. Kropf; R.J. Finch; J.C. Cunnane
Magnetohydrodynamic Simulations of the Formation of Cold Fronts in Clusters of Galaxies including Heat Conduction
Recent Chandra observations of clusters of galaxies revealed the existence of a sharp ridge in the X-ray surface brightness where the temperature drops across the front. This front is called the cold front. We present the results of two-dimensional magnetohydrodynamic simulations of the time evolution of a dense subcluster plasma moving in a cluster of galaxies. Anisotropic heat conduction along the magnetic field lines is included. In the models without magnetic fields, the numerical results indicate that the heat conduction from the hot ambient plasma heats the cold dense plasma of the subcluster and diffuses out the cold front. When magnetic fields exist in a cluster of galaxies, however, cold fronts can be maintained because the heat conduction across the magnetic field lines is suppressed. We found that, even when the magnetic fields in a cluster of galaxies are disordered, heat conduction across the front is restricted because the magnetic field lines are stretched along the front. Numerical results reproduced the X-ray intensity distribution observed in the A3667 cluster of galaxies.
Naoki Asai; Naoya Fukuda; Ryoji Matsumoto
Front Vehicle Setup Information Downloadable Dynamometer Database (D
Chevrolet Volt- 20F Chevrolet Volt- 20F Test cell location Front Vehicle Setup Information Downloadable Dynamometer Database (D 3 )- Test Summary Sheet Vehicle architecture EREV Vehicle dynamometer Input Document date 8/7/2013 Advanced Powertrain Research Facility Test weight [lb] Target A [lb] 4000 28.66 Target B [lb/mph] Target C [lb/mph^2] -0.0132 0.0202 Revision Number 3 Notes: Test Fuel Information Fuel type EPA Tier II EEE Fuel density [g/ml] Fuel Net HV [BTU/lbm] 0.743 18490 T e s t I D [ # ] C y c l e C o l d s t a r t ( C S t ) H o t s t a r t [ H S t ] D a t e T e s t C e l l T e m p [ C ] T e s t C e l l R H [ % ] T e s t C e l l B a r o [ i n / H g ] V e h i c l e c o o l i n g f a n s p e e d : S p e e d M a t c h [ S M ] o r c o n s t a n t s p e e d [ C S ] S o l a r L a m p s [ W / m 2 ] V e i c l e C l i m a t e C o n t r o l s e t t i n g s H o o d P o s i t i o n [ U p ] o r [ C l o s e d ] W i n d o w P o s i t i o n [ C l o s e d ] o r [ D o w n ] C y c l e D i s t a n c e [ m i ] C y c l e F u
Propagation of Front Waves in Myelinated Nerve Fibres: New Electrical Transmission Lines Constituted of Linear and Nonlinear Portions
In this paper, the authors examine the propagation of wave fronts in myelinated nerve fibres and applications as electrical transmission lines constituted of linear and nonlinear portions. Numerical simulations show that the front introduced in the nonlinear ... Keywords: Demyelination, Electrical Line, Front Wave, Myelinated Fibre, Regenerative, Remyelination
A�ssatou Mboussi Nkomidio; Paul Woafo
News Features | ornl.gov
News & Awards News & Awards News Releases Honors & Awards News Features Advanced Materials Home | Science & Discovery | Advanced Materials | News & Awards | News Features News Features 1-2 of 2 Results Nanotech toolbox July 01, 2013 - One of the most remarkable aspects of this super-small-scale world is that, under the right conditions, bits and pieces of materials will put themselves together-a natural phenomenon known as self-assembly. For example, polymer molecules, like the ones used to make plastic bags, organize themselves into a variety of structures based on what's going on in their environment. New family of tiny crystals glow bright in LED lights May 23, 2013 - Minuscule crystals that glow different colors may be the missing ingredient for white LED lighting that illuminates homes and
Green Power Network: Featured Reports
Alphabetical Listing Alphabetical Listing Categorical Listing Chronological Listing Featured Reports Featured Reports Selected from from our Library of Green Power Publications Some of the following documents are available as Adobe Acrobat PDFs. Download Adobe Reader. Feature Report Heeter, J., T. Nicholas, 2013. Status and Trends in the U.S. Voluntary Green Power Market (2012 Data). NREL Report No. TP-6A20-60210. (PDF 1.2 MB) Heeter, J., 2013. Renewable Energy Certificate (REC) Tracking Systems: Costs & Verification Issues (Presentation). NREL/PR-6A20-60640. (PDF 517 KB) Heeter, J., P. Armstrong, L. Bird, 2012. Market Brief: Status of the Voluntary Renewable Energy Certificate Market (2011 Data). NREL/TP-6A20-52925 (PDF 974 KB) Bird, L., A. Reger, and J. Heeter, 2012. Distributed Solar Incentive
Feature Stories | Argonne National Laboratory
Feature Stories Feature Stories Topic - Any - Energy -Energy efficiency --Vehicles ---Alternative fuels ---Automotive engineering ---Biofuels ---Diesel ---Electric drive technology ---Hybrid & electric vehicles ---Hydrogen & fuel cells ---Internal combustion ---Powertrain research ---Vehicle testing --Building design --Manufacturing -Energy sources --Renewable energy ---Bioenergy ---Hydropower ---Solar energy ---Wind energy --Hydrogen --Nuclear energy ---Nuclear energy modeling & simulation ---Nuclear fuel cycle ----Geology & disposal ---Reactors ----Nuclear reactor safety ----Nuclear reactor materials ----Nuclear system technologies & diagnostics -Energy usage --Energy life-cycle analysis --Energy storage ---Batteries ----Lithium-ion batteries ----Lithium-air batteries ----Sodium batteries --Electricity
Featured Webinars | Open Energy Information
Featured Webinars Featured Webinars Jump to: navigation, search This page highlights the webinars conducted by the Coordinated Low Emissions Assistance Network, Clean Energy Solutions Center, Enhancing Capacity for Low Emissions Development Strategies program, and the LEDS Global Dialogue Working Group. Finance Webinars CESC-Webinar: Building an Innovation and Entrepreneurship Driven Economy: How Policies Can Foster Risk Capital Investment in Renewable Energy CESC-Webinar: Financial and Policy Innovations to Support Energy Efficiency: Energy Performance Contracting and On-Bill Financing Implementation Webinars GHG Inventory Webinars Low-carbon plans/TNAs/NAMAs Webinars CLEAN-Capacity Building and Training for Low Emissions Development Planning CLEAN-Linked Open Data (LOD) Webinar
Hybrid Electric Vehicle Accelerated Testing - July 2008 One front-wheel drive and one 4-wheel drive Ford Escape hybrid electric vehicles (HEV) entered Accelerated testing during...
DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in
DOE Offers Conditional Loan Guarantee for Front End Nuclear DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho May 20, 2010 - 12:00am Addthis Washington, DC - As part of a broad effort to expand the use of nuclear power in the United States and reduce carbon pollution, U.S. Secretary of Energy Steven Chu announced today the Department's first conditional commitment for a front-end nuclear facility. The $2 billion loan guarantee will support AREVA's Eagle Rock Enrichment Facility near Idaho Falls, Idaho, which will supply uranium enrichment services for the U.S. nuclear power industry. "Increasing uranium enrichment in the United States is critical to the nation's energy and national security," said Secretary Chu. "Existing
Midtropospheric Anticyclonic Vortex Street Associated with a Cloud Band near a Cold Front
The characteristics and formation mechanism of an anticyclonic vortex street of meso-? scale, which appeared near a cold front around the Ryukyu Islands, Japan, on 11 April 1995, were examined by an analysis of observational data, a numerical ...
Eizi Toyoda; Hiroshi Niino; Kazuhisa Tsuboki; Ryuji Kimura; Masanori Yoshizaki
The Role of Stratification in the Formation and Maintenance of Shelf-Break Fronts
A mechanism is described for the formation or a front at the edge of a continental shelf in an initially linearly stratified fluid lacking horizontal density gradients. A primitive equation numerical model is used with a specified vertically ...
Occurrence and Structure of Mesoscale Fronts and Cyclones near Icy Bay, Alaska
When synoptic-scale cyclones stagnate against the mountains of southeast Alaska, a trough extends to the northwest, along the southern Alaskan coast. A front between maritime and continental air masses develops along the coast. During early ...
Michael Reynolds
Boundary Layer Control of Buoyant Coastal Currents and the Establishment of a Shelfbreak Front
The bottom boundary layer exerts a powerful control over buoyant coastal currents that contact the bottom, providing a mechanism for trapping density fronts along isobaths. Recent observations suggest that this mechanism may play a role in ...
Analysis and Diagnosis of the Composition of Ageostrophic Circulations in Jet-Front Systems
Diagnostic case studies of ageostrophic circulations in upper-tropospheric jet-front systems are presented, using the numerical analyses of the ECMWF model as data sources. The impact of the ECMWF analysis procedure on the retrieved ageostrophic ...
Jean-Pierre Cammas; Daniel Ramond
Downwelling-Front Instability and Eddy Formation in the Eastern Mediterranean
The instability of the downwelling front along the southern coast of Asia Minor is studied with a multimode quasigeostrophic model. Linear analysis shows that the most unstable wave has a length of about 100 km, The wavelength depends only very ...
Yizhak Feliks; Michael Ghil
What Maintains the SST Front North of the Eastern Pacific Equatorial Cold Tongue?
A coupled ocean�atmosphere regional model suggests a mechanism for formation of a sharp sea surface temperature (SST) front north of the equator in the eastern Pacific Ocean in boreal summer and fall. Meridional convergence of Ekman transport at ...
Simon P. de Szoeke; Shang-Ping Xie; Toru Miyama; Kelvin J. Richards; R. Justin O. Small
Forecasting the Impacts of Strong Wintertime Post-Cold Front Winds in the Northern Plains
Strong post-cold front wind events in the northern plains of the United States are a difficult problem for operational forecasters. The various atmospheric ingredients that lead to these events are examined from an operational point of view. ...
Anton F. Kapela; Preston W. Leftwich; Richard Van Ess
Sensitivity of Mesoscale Gravity Waves to the Baroclinicity of Jet-Front Systems
This study investigates the sensitivity of mesoscale gravity waves to the baroclinicity of the background jet-front systems by simulating different life cycles of baroclinic waves with a high-resolution mesoscale model. Four simulations are made ...
Shuguang Wang; Fuqing Zhang
Ocean Fronts off California: A New Product from GOES Satellite Data
COASTAL OCEAN RESEARCH R/CZ-181: 3.1.2002�2.28.2005 Ocean Fronts off California: A Newsurfers who complain that the ocean is coldest in spring are
Breaker, Laurence
Simulation of chemical reaction fronts in anaerobic digestion of solid waste
A case study for parallelisation of a code for a nonlinear system of evolution equations is presented. It describes the propagation of reaction fronts in anaerobic waste digestion. These occur as a consequence of heterogeneous initial distributions of ...
Hermann J. Eberl
Mesoscale Modeling of a Cold Front and Its Interaction with a Diurnally Heated Land Mass
A mesoscale numerical model incorporating a detailed planetary boundary-layer scheme, including momentum, heat and moisture exchange with the lower boundary, is used to study the change in structure of a dry summertime front as it moves towards a ...
William L. Physick
VHF Radar Observations of Gravity-Wave Production by Cold Fronts over Southern Australia
Four extended observational campaigns were conducted during August and November 1988 with an ST (stratosphere�troposphere) radar in southern Australia during the passage of cold fronts over the system, giving around 30 days of three-dimensional ...
Stephen D. Eckermann; Robert A. Vincent
The Southerly Burster of South Eastern Australia: An Orographically Forced Cold Front
This paper presents an observational study of the �southerly burster�, or �southerly buster�, a particularly intense type of orographically and thermally influenced cold front which occurs in spring and summer along the southern coast of New ...
J. R. Colquhoun; D. J. Shepherd; C. E. Coulman; R. K. Smith; K. McInnes
On the Movement and Low-Level Structure of Cold Fronts
This paper presents a review of theoretical and observational studies relating to the low-level structure of cold fronts and explores the factors that are pertinent to frontal motion.
Roger K. Smith; Michael J. Reeder
Direct Observations of Along-Isopycnal Upwelling and Diapycnal Velocity at a Shelfbreak Front
By mapping the three-dimensional density field while simultaneously tracking a subsurface, isopycnal float, direct observations of upwelling along a shelfbreak front were made on the southern flank of Georges Bank. The thermohaline and bio-...
John A. Barth; Dave Hebert; Andrew C. Dale; David S. Ullman
Location of the Antarctic Polar Front from AMSR-E Satellite Sea Surface Temperature Measurements
The location of the Southern Ocean polar front (PF) is mapped from the first 3 yr of remotely sensed Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) sea surface temperature (SST) measurements. In agreement with ...
Shenfu Dong; Janet Sprintall; Sarah T. Gille
Use of Synthetic Aperture Radar in Finescale Surface Analysis of Synoptic-Scale Fronts at Sea
The viability of synthetic aperture radar (SAR) as a tool for finescale marine meteorological surface analyses of synoptic-scale fronts is demonstrated. In particular, it is shown that SAR can reveal the presence of, and the mesoscale and ...
G. S. Young; T. N. Sikora; N. S. Winstead
The Life Cycle of an Undular Bore and Its Interaction with a Shallow, Intense Cold Front
The evolution of an undular bore and its associated wind shift, spawned by the passage of a shallow surface cold front over the Southern Great Plains of the United States, is examined using surface and remote sensing observations along with ...
Daniel C. Hartung; Jason A. Otkin; Jonathan E. Martin; David D. Turner
The Life Cycle of Thunderstorm Gust Fronts as Viewed with Doppler Radar and Rawinsonde Data
This paper presents the time-dependent analysis of the thunderstorm gust front with the use of Project NIMROD data. RHI cross sections of reflectivity and Doppler velocity are constructed to determine the entire vertical structure. The life cycle ...
Roger M. Wakimoto
Observations of a Subtropical Cold Front in a Region of Complex Terrain
The passage of shallow cold fronts during the late spring and early summer months over the island of Taiwan is often accompanied by heavy rainfall and occasional flash flood episodes. Previous studies have emphasized the weak baroclinicity of ...
Stanley B. Trier; David B. Parsons; Thomas J. Matejka
Identification of Atmospheric Fronts over the Ocean with Microwave Measurements of Water Vapor and Rain
This Paper describes some basic research techniques and algorithms developed to diagnose fronts in cyclonic storms over the ocean with data from satellite-borne microwave radiometers. The need for this research stems from the limited availability ...
Kristina B. Kanaros; Iffekhar Bhatti; Llynn A. Mcmurdie; Grant W. Petty
Major Cloud Plumes in the Arctic and Their Relation to Fronts and Ice Movement
A study of the movement of orographic cloud plumes from one island to another in the Svalbard-Novaya Zemlya region of the Barents Sea revealed a close association with similar movements of arctic fronts. Strong northerly winds behind arctic ...
Robert W. Fett
Influences of the Sierra Nevada on Intermountain Cold-Front Evolution
Recent studies indicate that strong cold fronts develop frequently downstream of the Sierra Nevada over the Intermountain West. To help ascertain why, this paper examines the influence of the Sierra Nevada on the rapidly developing Intermountain ...
Gregory L. West; W. James Steenburgh
Kinematic and Moisture Characteristics of a Nonprecipitating Cold Front Observed during IHOP. Part II: Alongfront Structures
Kinematic and thermodynamic structures of a nonprecipitating cold front observed in west-central Kansas on 10 June 2002 during the International H2O Project (IHOP) are examined with dropsondes and airborne instrumentation that includes Doppler ...
Numerical Study of Precipitation Core-Gap Structure along Cold Fronts
The mechanism responsible for the core-gap structure of precipitation along narrow cold-frontal rainbands (NCFRs) is investigated through analyses of idealized cloud-resolving simulations of cold fronts. The control simulation, in which the ...
Masayuki Kawashima
Influence of the Subtropical Andes on Baroclinic Disturbances: A Cold Front Case Study
The Andes Cordillera produces a significant disruption to the structure and evolution of the weather systems that cross South America. In particular, cold fronts tend to be �channeled� to the north immediately to the east of the Andes, fostering ...
Marcelo E. Seluchi; Ren�D. Garreaud; Federico A. Norte; A. Celeste Saulo
The Orographic Modulation of Pre-Warm-Front Precipitation in Southern New England
Topographic forcing over the hills and small mountains of southern New England plays an important role in determining the distribution of pre-warm-front precipitation from winter cyclones. Upslope regions receive 20�60% more precipitation than do ...
Richard E. Passarelli Jr.; Hannah Boehme
A Mean Synoptic View of the Subantarctic Front South of Australia
A mean synoptic view of the subantarctic front (SAF) is obtained from current meter and hydrographic data by averaging absolute and baroclinic velocity measurements in bins defined by a cross-stream coordinate that moves with the current. The ...
Helen E. Phillips; Stephen R. Rintoul
Relationship between a Weakening Cold Front, Misocyclones, and Cloud Development on 10 June 2002 during IHOP
The finescale structure and evolution of a cold front in the presence of small-scale circulations are examined using overdetermined dual-Doppler syntheses of mobile radar data along with thermodynamic data and cloud imagery collected on 10 June ...
Nettie R. Arnott; Yvette P. Richardson; Joshua M. Wurman; Erik M. Rasmussen
Experimental evaluation of the in-plane seismic behavior of store-front window systems
J. , (1960). Behavior of window panels under in-planeC. , (1997). Behavior of window glass panels duringBehavior of Store-front Window Systems A thesis submitted in
Eva, Charles Almond
The Stability of Steady Fronts and the Adjoint Method: Nonmodal Frontal Waves
The adjoint method for finding optimal or singular modes is employed for studying the finite time stability of steady, tw0-dimensional atmospheric fronts as represented by the uniform potential vorticity semigeostrophic model.
Alain Joly
The Norwegian IPY�THORPEX: Polar Lows and Arctic Fronts during the 2008 And�ya Campaign
From a weather forecasting perspective, the Arctic poses particular challenges for mainly two reasons: 1) The observational data are sparse and 2) the weather phenomena responsible for severe weather, such as polar lows, Arctic fronts, and orographic ...
J. E. Kristj�nsson; I. Barstad; T. Aspelien; I. F�re; �. God�y; �. Hov; E. Irvine; T. Iversen; E. Kolstad; T. E. Nordeng; H. McInnes; R. Randriamampianina; J. Reuder; �. Saetra; M. Shapiro; T. Spengler; H. �lafsson
Light-Front Quantization of the Polyakov D1 Brane Action With a Scalar Dilaton Field
Light-front quantization of the conformally gauge-fixed Polyakov D1 brane action with a scalar dilaton field is studied using the equal light-cone world-sheet time framework.
D. S. Kulshreshtha
Cold Fronts Aloft and the Forecasting of Precipitation and Severe Weather East of the Rocky Mountains
Brief descriptions are given of four cases that illustrate the important role that cold fronts aloft (CFA) can play in producing significant weather cast of the Rocky Mountains. In all four cases, the CFA, and its associated short wave, were ...
Peter V. Hobbs; John D. Locatelli; Jonathan E. Martin
Coevolution of inverse cascade and nonlinear heat front in shear flows of strongly coupled Yukawa liquids
Using classical molecular dynamics (MD) simulations, we report on the development and propagation of a nonlinear heat front in parallel shear flows of a strongly coupled Yukawa liquid. At a given coupling strength, a subsonic shear profile is superposed on an equilibrated Yukawa liquid and Kelvin Helmholtz (KH) instability is observed. Coherent vortices are seen to emerge towards the nonlinear regime of the instability. It is seen that while inverse cascade leads to a continuous transfer of flow energy towards the largest scales, there is also a simultaneous transfer of flow energy into the thermal velocities of grains at the smallest scale. The latter is an effect of velocity shear and thus leads to the generation of a nonlinear heat front. In the linear regime, the heat front is seen to propagate at speed much lesser than the adiabatic sound speed of the liquid. Spatio-temporal growth of this heat front occurs concurrently with the inverse cascade of KH modes.
Ashwin, J.; Ganesh, R. [Institute for Plasma Research, Bhat, Gandhinagar 382428, Gujarat (India)
Results Obtained with the SNS H - Ion Source and LEBT atVarious contributions by SNS authors to these conferenceCOMMISSIONING OF THE SNS FRONT-END SYSTEMS AT BERKELEY LAB*
Stockli, R. Welton, and M. White (SNS-ORNL); J. Power and M.VI. REFERENCES N. Holtkamp, �The SNS Linac and Storage Ring:the FES Team, �Status of the SNS Front-End Sys- tems, Paper
The Marine Boundary Layer in the Vicinity of an Ocean Front
Aircraft observations obtained during the Frontal Air�Sea Interaction Experiment (FASINEX) are used to investigate the structure of the marine atmospheric boundary layer in the vicinity of an ocean front. A quasi-stationary sea surface ...
David P. Rogers
Unstable Waves on Oceanic Fronts: Large Amplitude Behavior and Mean Flow Generation
A primitive equation numerical model is used to study the large amplitude behavior of unstable waves on an oceanic density front, concentrating on a single wave mode corresponding to the fastest growing linear solution. At Small amplitude the ...
Richard A. Wood
Mesoscale Energy Spectra of Mei-Yu Front System. Part I: Kinetic Energy Spectra
The mesoscale kinetic energy (KE) spectra of Mei-Yu front system are investigated through idealized numerical simulations. In the mature stage, the upper tropospheric KE spectrum resembles a -3 power law for wavelengths between 1000 and 400 km and ...
Jun Peng; Lifeng Zhang; Yu Luo; Yun Zhang
The Evolution of an Observed Cold Front. Part II: Mesoscale Dynamics
A detailed analysis is made of a three-dimensional numerical simulation of the evolution of an observed moist frontal system over a 48 h period. The simulated front undergoes an initial period of frontogenetic growth, characterized by an ...
Isidoro Orlanski; Bruce B. Ross
The Evolution of an Observed Cold Front. Part I. Numerical Simulation
The 48 h evolution of an observed cold front is simulated by a three-dimensional mesoscale-numerical model for a typical springtime synoptic situation over the southeastern United States. The model used in this study employs anelastic equations ...
Bruce B. Ross; Isidoro Orlanski
A survey of front end modularity as an automotive architecture and its ability to deliver value
The partitioning of a system can and will dictate the creative space for a designer or engineer. This thesis will analyze how using a new automotive architecture known as a Front End Module (FEM) can affect a limited ...
Mah�, Vincent R. (Vincent Robert)
Absolute Transports of Mass and Temperature for the North Atlantic Current� Subpolar Front System
The flow of subtropical waters carried into the northern North Atlantic Ocean by the North Atlantic Current� subpolar front system (NAC�SPF) is an important component of the meridional overturning circulation. These waters become colder and ...
Paula P�rez-Brunius; Tom Rossby; D. Randolph Watts
A 6-yr Climatology of Fronts Affecting Helsinki, Finland, and Their Boundary Layer Structure
A 6-yr climatology of the frequency, characteristics, and boundary layer structure of synoptic-scale fronts in Helsinki, Finland, was created using significant weather charts and observations from a 327-m-tall mast and from the Station for ...
Victoria A. Sinclair
Boundary layer convergence induced by strong winds across a midlatitude SST front
Recent studies indicate that midlatitude SST fronts� influence extends through the marine atmospheric boundary layer (MABL) into the free atmosphere, with implications for climate variability. To better understand the mechanisms of this ocean-to-...
Thomas Kilpatrick; Niklas Schneider; Bo Qiu
Low-Frequency Variability in the Midlatitude Atmosphere Induced by an Oceanic Thermal Front
This study examines the flow induced in a highly idealized atmospheric model by an east�west-oriented oceanic thermal front. The model has a linear marine boundary layer coupled to a quasigeostrophic, equivalent- barotropic free atmosphere. The ...
Diapycnal Diffusivity Inferred from Scalar Microstructure Measurements near the New England Shelf/Slope Front
Conductivity microstructure was used to estimate the diapycnal thermal eddy diffusivity KT near the New England shelf/slope front in early August 1997. Two datasets were collected with a towed vehicle. One involved several horizontal tows in and ...
Chris R. Rehmann; Timothy F. Duda
The Cold Front of 15 April 1994 over the Central United States. Part I: Observations
Detailed observations of the interactions of a cold front and a dryline over the central United States that led to dramatic undulations in the boundary layer, including an undular bore, are investigated using high-resolution water vapor mixing ...
B. B. Demoz; D. O�C. Starr; K. D. Evans; A. R. Lare; D. N. Whiteman; G. Schwemmer; R. A. Ferrare; J. E. M. Goldsmith; S. E. Bisson
A Laboratory Model of Thermocline Depth and Exchange Fluxes across Circumpolar Fronts
A laboratory experiment has been constructed to investigate the possibility that the equilibrium depth of a circumpolar front is set by a balance between the rate at which potential energy is created by mechanical and buoyancy forcing and the ...
Claudia Cenedese; John Marshall; J. A. Whitehead
Topographic Distortion of a Cold Front over the Snake River Plain and Central Idaho Mountains
The topographic distortion of a cold front over the Snake River Plain (SRP) and central Idaho Mountains on 3 December 1998 is described using high-density surface observations from MesoWest, a collection of meteorological networks over the ...
W. James Steenburgh; Thomas R. Blazek
On the Front Lines 162 Los Alamos Science Number 23 1995
On the Front Lines 162 Los Alamos Science Number 23 1995 I n 1943, the Manhattan Project. Baumbach, S. Fried, P. L. Kirk and, R. S. Rosenfels (Manhattan Project Report CK-1143, December 1943
Massey, Thomas N.
Potential Vorticity and Vertical Velocity at the Iceland-F�r�s Front
Using data from high-resolution surveys of the Iceland- F�r�s Front, the authors have calculated synoptic maps of the geostrophic velocity, vorticity, and potential vorticity on isopycnal surfaces. The data have also been used to diagnose the ...
J. T. Allen; D. A. Smeed
Non-Adiabatic Effects on Combustion Front Propagation in Porous Media: Multiplicity of Steady States
The sustained propagation of combustion fronts in porous media is a necessary condition for the success of an in situ combustion project for oil recovery. Compared to other recovery methods, in situ combustion involves the added complexity of exothermic reactions and temperature-dependent chemical kinetics. In the presence of heat losses, the possibility of ignition and extinction (quenching) exists. In this report, we address the properties of combustion fronts propagating at a constant velocity in the presence of heat losses.
Akkutlu, I. Yucel; Yortsos, Yanis C.
Coordinate-free description of corrugated flames with realistic density drop at the front
The complete set of hydrodynamic equations for a corrugated flame front is reduced to a system of coordinate-free equations at the front using the fact that vorticity effects remain relatively weak even for corrugated flames. It is demonstrated how small but finite flame thickness may be taken into account in the equations. Similar equations are obtained for turbulent burning in the flamelet regime. The equations for a turbulent corrugated flame are consistent with the Taylor hypothesis of stationary external turbulence.
Vitaly Bychkov; Maxim Zaytsev; V'yacheslav Akkerman
Influence of p-method finite element parameters on predictions of crack front geometry
The effect of various p-method finite element model parameters on the prediction of planar crack front geometry in three dimensional structures is evaluated. An automatic crack growth method was developed using the commercial software StressCheck coupled ... Keywords: ?, Corner crack, Crack front, Finite element, Mesh, Stress intensity factor, a, b, b/a, c, ctrat, ipr, m, mrat, p-method, trans
Diane Wowk, Kyle Gamble, Ross Underhill
Wave front fragmentation due to ventricular geometry in a model of the rabbit heart
The role of the heart�s complex shape in causing the fragmentation of activation wave fronts characteristic of ventricular fibrillation (VF) has not been well studied. We used a finite element model of cardiac propagation capable of simulating functional reentry on curved two-dimensional surfaces to test the hypothesis that uneven surface curvature can cause local propagation block leading to proliferation of reentrant wave fronts. We found that when reentry was induced on a flat sheet
Jack M. Rogers
On selecting Gabor features for biometric authentication
We describe a Gabor feature selection technique that allows us to develop a fast and robust Gabor-feature based biometric system. Existing Gabor based methods use a huge number of Gabor features to represent the patterns. Our experiments on different ... Keywords: Gabor features, automated identification, biometrics, ear authentication, equal error rate, feature selection, finger authentication
Loris Nanni; Alessandra Lumini
Comparing visual features for morphing based recognition
This thesis presents a method of object classification using the idea of deformable shape matching. Three types of visual features, geometric blur, C1 and SIFT, are used to generate feature descriptors. These feature ...
Wu, Jia Jane
Argonne Transportation - 2005 Features Archive
5 Features Archive 5 Features Archive South African Science Park Street Naming Michael Thackeray of Argonne National Laboratory's Chemical Engineering Division was recently honored as one of 11 notable South African scientists and innovators to have streets named after them in Pretoria's new Innovation Hub science park. (More...) Electrochemical Society Battery Division Research Award Michael Thackeray of Argonne National Laboratory received the 2005 Research Award of the Battery Division of the Electrochemical Society. The award was established in 1958 to recognize outstanding contributions to the science and technology of primary and secondary cells and batteries and fuel cells. (More...) SAE Barry D. McNutt Award for Excellence in Automotive Policy Analysis Steve Plotkin of Argonne's Center for Transportation Research was the winner of the Society for Automotive Engineers (SAE) 2005 Barry D. McNutt Award, which recognizes the importance of sound policy analysis and inspires members of the mobility community in government, industry and elsewhere to strive for excellence. (More...)
Argonne Transportation - 2003 Features Archive
3 Features Archive 3 Features Archive Society of Tribologists and Lubrication Engineers Fellow Ali Erdemir of Argonne's Energy Technology Division has been named a Fellow of the Society of Tribologists and Lubrication Engineers (STLE). Last year, Erdemir received the Al Sonntag Award and the Allan A. Manteuffel Award from STLE's Chicago chapter for his development of a carbon coating that showed the lowest coefficient of friction (less than .001) when tested in a dry nitrogen atmosphere. (More...) Argonne Researcher Honored for Career in Engine Research The American Society of Mechanical Engineers (ASME) honored Argonne's Ramanujam (Raj) Sekar by elevating his membership to the status of a Fellow, in recognition of his many "significant engineering achievements and contributions to the engineering profession" over a career spanning more than 33 years. Sekar manages the Engine and Emissions Research Group at Argonne's Transportation Technology R&D Center. (More...)
Argonne Transportation - 2008 Features Archive
8 Features Archive 8 Features Archive Battery Test Facility Since 1976, researchers have used Argonne's Electrochemical Analysis and Diagnostics Laboratory to study advanced battery systems for applications such as hybrid and plug-in hybrid electric vehicles and utility load-leveling during peak demand periods. The facility houses a computer-operated test laboratory, where individual cells and multicell modules of battery systems are subjected to performance and lifetime tests under simulated real-world conditions. (More...) EnerDel/Argonne Advanced High-Power Battery for Hybrid Electric Vehicles The EnerDel/Argonne lithium-ion battery is a highly reliable and extremely safe device that is lighter in weight, more compact, more powerful and longer-lasting than the nickel-metal hydride (Ni-MH) batteries in today's hybrid electric vehicles (HEVs). (More...)
PETSc: Features: Nvidia GPU support
Nvidia GPU support Nvidia GPU support Home Download Features Component Details Diagram GPUs Theads Documentation Applications/Publications Miscellaneous External Software Developers Site PETSc algebraic solvers now run on Nvidia GPU systems. This sometimes provides an alternative high-performance, low-cost solution technique. We recommend working with petsc-dev if you wish to work witht his feature. If you use the PETSc GPU code in your published work, please cite the following paper: @article{minden2010preliminary, title={Preliminary implementation of PETSc using GPUs}, author={Minden, V. and Smith, B.F. and Knepley, M.G.}, journal={Proceedings of the 2010 International Workshop of GPU Solutions to Multiscale Problems in Science and Engineering}, year={2010} } WARNING: Using GPUs effectively is difficult! You must be dedicated and
Argonne Transportation - 2000 Features Archive
0 Features Archive 0 Features Archive Argonne Technology Wins R&D 100 Award Argonne researchers have won an R&D 100 Award for developing a catalyst that may help bring environmentally friendly electric cars to the marketplace. These awards are given annually by R&D Magazine to the 100 most significant technical products of the year. (More...) Argonne's Automotive Recycling Processes Win Awards The automobile shredder industry recovers over 10 million tons of ferrous (iron-containing) scrap annually from obsolete automobiles and sells the metals at a significant profit. After metals recovery, though, the auto recyclers are left with about 5 million tons of nonmetallic auto shredder residue (ASR) to dispose of annually. Argonne's processes to recover valuable plastics from this scrap have won two prestigious awards. (More...)
Well-to-Wheels analysis of landfill gas-based pathways and their addition to the GREET model.
Today, approximately 300 million standard cubic ft/day (mmscfd) of natural gas and 1600 MW of electricity are produced from the decomposition of organic waste at 519 U.S. landfills (EPA 2010a). Since landfill gas (LFG) is a renewable resource, this energy is considered renewable. When used as a vehicle fuel, compressed natural gas (CNG) produced from LFG consumes up to 185,000 Btu of fossil fuel and generates from 1.5 to 18.4 kg of carbon dioxide-equivalent (CO{sub 2}e) emissions per million Btu of fuel on a 'well-to-wheel' (WTW) basis. This compares with approximately 1.1 million Btu and 78.2 kg of CO{sub 2}e per million Btu for CNG from fossil natural gas and 1.2 million Btu and 97.5 kg of CO{sub 2}e per million Btu for petroleum gasoline. Because of the additional energy required for liquefaction, LFG-based liquefied natural gas (LNG) requires more fossil fuel (222,000-227,000 Btu/million Btu WTW) and generates more GHG emissions (approximately 22 kg CO{sub 2}e /MM Btu WTW) if grid electricity is used for the liquefaction process. However, if some of the LFG is used to generate electricity for gas cleanup and liquefaction (or compression, in the case of CNG), vehicle fuel produced from LFG can have no fossil fuel input and only minimal GHG emissions (1.5-7.7 kg CO{sub 2}e /MM Btu) on a WTW basis. Thus, LFG-based natural gas can be one of the lowest GHG-emitting fuels for light- or heavy-duty vehicles. This report discusses the size and scope of biomethane resources from landfills and the pathways by which those resources can be turned into and utilized as vehicle fuel. It includes characterizations of the LFG stream and the processes used to convert low-Btu LFG into high-Btu renewable natural gas (RNG); documents the conversion efficiencies and losses of those processes, the choice of processes modeled in GREET, and other assumptions used to construct GREET pathways; and presents GREET results by pathway stage. GREET estimates of well-to-pump (WTP), pump-to-wheel (PTW), and WTW energy, fossil fuel, and GHG emissions for each LFG-based pathway are then summarized and compared with similar estimates for fossil natural gas and petroleum pathways.
Mintz, M.; Han, J.; Wang, M.; Saricks, C.; Energy Systems
Analytical features: a knowledge-based approach to audio feature generation
We present a feature generation system designed to create audio features for supervised classification tasks. The main contribution to feature generation studies is the notion of analytical features (AFs), a construct designed to support the representation ...
Fran�ois Pachet; Pierre Roy
Hydrogen Pathways: Cost, Well-to-Wheels Energy Use, and Emissions for the Current Technology Status of Seven Hydrogen Production, Delivery, and Distribution Scenarios
Hydrogen Pathways: Cost, Hydrogen Pathways: Cost, Well-to-Wheels Energy Use, and Emissions for the Current Technology Status of Seven Hydrogen Production, Delivery, and Distribution Scenarios Mark Ruth National Renewable Energy Laboratory Melissa Laffen and Thomas A. Timbario Alliance Technical Services, Inc. Technical Report NREL/TP-6A1-46612 September 2009 Technical Report Hydrogen Pathways: Cost, NREL/TP-6A1-46612 Well-to-Wheels Energy Use, September 2009 and Emissions for the Current Technology Status of Seven Hydrogen Production, Delivery, and Distribution Scenarios Mark Ruth National Renewable Energy Laboratory Melissa Laffen and Thomas A. Timbario Alliance Technical Services, Inc. Prepared under Task No. HS07.1002 National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393
Wheel running from a juvenile age delays onset of specific motor deficits but does not alter protein aggregate density in a mouse model of Huntington's disease
of age (Fig. 2B; wheel running: F [1, 25] = 0.40, P = 0.72; 2-way ANOVA). At 5 months, an effect of the HD BMC Neuroscience 2008, 9:34 http://www.biomedcentral.com/1471-2202/9/34 mutation on performance was observed (Fig. 2B; HD: F[1, 28] = 8.58, P < 0... in activity on the second day of testing (2nd blocks in Fig. 3B) in non-enriched HD mice (F[1,38] = 38.25, P < 0.001; 2-way ANOVA). Thus environmental enrichment and wheel running both rescued the abnor- mal habituation of rearing behavior in HD mice...
van Dellen, Anton; Cordery, Patricia M; Spires, Tara L; Blakemore, Colin; Hannan, Anthony J
Design of the NSLS-II Linac Front End Test Stand
The NSLS-II operational parameters place very stringent requirements on the injection system. Among these are the charge per bunch train at low emittance that is required from the linac along with the uniformity of the charge per bunch along the train. The NSLS-II linac is a 200 MeV linac produced by Research Instruments Gmbh. Part of the strategy for understanding to operation of the injectors is to test the front end of the linac prior to its installation in the facility. The linac front end consists of a 100 kV electron gun, 500 MHz subharmonic prebuncher, focusing solenoids and a suite of diagnostics. The diagnostics in the front end need to be supplemented with an additional suite of diagnostics to fully characterize the beam. In this paper we discuss the design of a test stand to measure the various properties of the beam generated from this section. In particular, the test stand will measure the charge, transverse emittance, energy, energy spread, and bunching performance of the linac front end under all operating conditions of the front end.
Fliller III, R.; Johanson, M.; Lucas, M.; Rose, J.; Shaftan, T.
Apparatus for characterizing the temporo-spatial properties of a dynamic fluid front and method thereof
Methods and apparatus are described for characterizing the temporal-spatial properties of a dynamic fluid front within a mold space while the mold space is being filled with fluid. A method includes providing a mold defining a mold space and having one or more openings into the mold space; heating a plurality of temperature sensors that extend into the mold space; injecting a fluid into th emold space through the openings, the fluid experiencing a dynamic fluid front while filling the mold space with a fluid; and characterizing temporal-spatial properties of the dynamic fluid front by monitoring a termperature of each of the plurality of heated temperature sensors while the mold space is being filled with the fluid. An apparatus includes a mold defining a mold space; one or more openings for introducing a fluid into th emold space and filling the mold space with the fluid, the fluid experiencing a dynamic fluid front while filling the mold space; a plurality of heated temperature sensors extending into the mold space; and a computer coupled to the plurality of heated temperature sensors for characterizing the temporal-spatial properties of the dynamic fluid front.
Battiste, Richard L
Well-to-wheel energy use and greenhouse gas emissions of advanced fuel/vehicle systems North American analysis.
There are differing, yet strongly held views among the various ''stakeholders'' in the advanced fuel/propulsion system debate. In order for the introduction of advanced technology vehicles and their associated fuels to be successful, it seems clear that four important stakeholders must view their introduction as a ''win'': Society, Automobile manufacturers and their key suppliers, Fuel providers and their key suppliers, and Auto and energy company customers. If all four of these stakeholders, from their own perspectives, are not positive regarding the need for and value of these advanced fuels/vehicles, the vehicle introductions will fail. This study was conducted to help inform public and private decision makers regarding the impact of the introduction of such advanced fuel/propulsion system pathways from a societal point of view. The study estimates two key performance criteria of advanced fuel/propulsion systems on a total system basis, that is, ''well'' (production source of energy) to ''wheel'' (vehicle). These criteria are energy use and greenhouse gas emissions per unit of distance traveled. The study focuses on the U.S. light-duty vehicle market in 2005 and beyond, when it is expected that advanced fuels and propulsion systems could begin to be incorporated in a significant percentage of new vehicles. Given the current consumer demand for light trucks, the benchmark vehicle considered in this study is the Chevrolet Silverado full-size pickup.
Wang, M.
In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels
An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web.
Hall, Maclin S. (Marietta, GA); Jackson, Theodore G. (Atlanta, GA); Knerr, Christopher (Lawrenceville, GA)
An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web. 37 figs.
Hall, M.S.; Jackson, T.G.; Knerr, C.
Argonne Transportation - 2001 Features Archive
1 Features Archive 1 Features Archive SAE Award for Excellence in Oral Presentation Christopher Powell of Argonne National Laboratory's Center for Transportation Research (CTR) received a Society of Automotive Engineers (SAE) Award for Excellence in Oral Presentation for his presentation entitled "X-Ray Measurement of High Pressure Diesel Sprays" at the March 2001 SAE World Congress in Detroit, Michigan. (More...) Discover Award Finalist, Transportation: Using X-Ray Vision to Study Fuel Spray Processes Inside Engines By using high-brilliance X-rays from Argonnes Advanced Photon Source, researchers are able to obtain never-before-possible, time-resolved and quantitative information on the structure of gasoline and diesel fuel sprays at the very moment they enter the engine cylinder. Before the new X-ray vision technique, the portion of fuel sprays nearest the injector nozzle (the first one inch) had been too opaque for visible light to penetrate, leaving engine designers and manufacturers to guess at conditions inside the fuel spray
A Model for Tracking Fronts of Stress-Induced Permeability Enhancement
Using an analogy to the classical Stefan problem, we construct evolution equations for the fluid pore pressure on both sides of a propagating stress-induced damage front. Closed form expressions are derived for the position of the damage front as a function of time for the cases of thermally-induced damage as well as damage induced by over-pressure. We derive expressions for the flow rate during constant pressure fluid injection from the surface corresponding to a spherically shaped subsurface damage front. Finally, our model results suggest an interpretation of field data obtained during constant pressure fluid injection over the course of 16 days at an injection site near Desert Peak, NV.
K. C. Lewis; Satish Karra; Sharad Kelkar
Lewis, K C; Kelkar, Sharad
Report on the value engineering workshop on APS beamline front ends
A formal value engineering evaluation process was developed to address the front end components of the beamlines for the Advanced Photon Source (APS). This process (described in Section 2) involved an information phase, a creative phase, a judgment phase, a development phase, and a recommendation phase. Technical experts from other national laboratories and industry were invited to a two-day Value Engineering Workshop on November 5-6, 1992. The results of this Workshop are described in Section 4. Following the Workshop, various actions by the APS staff led to the redesign of the front end components, which are presented in Sections 5 and 6. The cost benefit analysis is presented in Section 7. It is important of realize that an added benefit of the Workshop was to obtain numerous design evaluations and enhancements of the front end components by experts in the field. As the design work proceeds to Title II completion, the APS staff is including many of these suggestions.
Kuzay, T.
Measures of the Environmental Footprint of the Front End of the Nuclear Fuel Cycle
Previous estimates of environmental impacts associated with the front end of the nuclear fuel cycle have focused primarily on energy consumption and CO2 emissions. Results have varied widely. Section 2 of this report provides a summary of historical estimates. This study revises existing empirical correlations and their underlying assumptions to fit to a more complete set of existing data. This study also addresses land transformation, water withdrawals, and occupational and public health impacts associated with the processes of the front end of the once-through nuclear fuel cycle. These processes include uranium mining, milling, refining, conversion, enrichment, and fuel fabrication. Metrics are developed to allow environmental impacts to be summed across the full set of front end processes, including transportation and disposition of the resulting depleted uranium.
Brett Carlsen; Emily Tavrides; Erich Schneider
Characteristics of Medical Research News Reported on Front Pages of Newspapers
Background: The placement of medical research news on a newspaper�s front page is intended to gain the public�s attention, so it is important to understand the source of the news in terms of research maturity and evidence level. Methodology/Principal Findings: We searched LexisNexis to identify medical research reported on front pages of major newspapers published from January 1, 2000 to December 31, 2002. We used MEDLINE and Google Scholar to find journal articles corresponding to the research, and determined their evidence level. Of 734 front-page medical research stories identified, 417 (57%) referred to mature research published in peer-reviewed journals. The remaining 317 stories referred to preliminary findings presented at scientific or press meetings; 144 (45%) of those stories mentioned studies that later matured (i.e. were published in journals within 3 years after news coverage). The evidence-level distribution of the 515
William Yuk; Yeu Lai; Trevor Lane
Alternative Muon Front-end for the International Design Study (IDS)
We discuss alternative designs of the muon capture front end of the Neutrino Factory International Design Study (IDS). In the front end, a proton bunch on a target creates secondary pions that drift into a capture channel, decaying into muons. A sequence of RF cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. This design is affected by limitations on accelerating gradients within magnetic fields. The effects of gradient limitations are explored, and mitigation strategies are presented
Alekou, A; Martini, M; Prior, G; Rogers, C; Stratakis, D; Yoshikawa, C; Zisman, M
The DCX-2 is a large, complex experimental apparatus. Its aim is the generation of a hot, dense plasma by the injection and dissociation of 600-kev hydrogen molecNoneular ions in a magnetic-mirror field. For facilitating this process, the molecular ions are given a long path in the machine, and the ion- pumping action of the plasma is used to maintain the vacuum. The major component systems of the apparatus are the ion source and accelerator, highvoltage power supply, magnet system, beam-injection duct, vacuum system, and dissociating arc. The design, construction, and performance of each component system, the constructional features not peculiar to any one component, and the instruments and techniques available for plasma study are described. (auth)
Bell, P.R.; Culver, J.S.; DeCamp, S.M.; Ezell, J.C.; Kelley, G.G.; Lazar, N.H.; Mackin, R.J. Jr.
Alternative Fuels Data Center: News and Features
Alternative Fuels and Advanced Vehicles Data Center (EERE)
About About Printable Version Share this resource Send a link to Alternative Fuels Data Center: News and Features to someone by E-mail Share Alternative Fuels Data Center: News and Features on Facebook Tweet about Alternative Fuels Data Center: News and Features on Twitter Bookmark Alternative Fuels Data Center: News and Features on Google Bookmark Alternative Fuels Data Center: News and Features on Delicious Rank Alternative Fuels Data Center: News and Features on Digg Find More places to share Alternative Fuels Data Center: News and Features on AddThis.com... More in this section... Project Assistance News & Features Spanish Resources Contacts News and Features The Alternative Fuels Data Center (AFDC) helps transportation decision makers find alternative fuel information, data, and tools through
Modern Geothermal Features | Open Energy Information
Modern Geothermal Features Modern Geothermal Features Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Modern Geothermal Features Dictionary.png Modern Geothermal Features: Active geothermal manifestations such as hot springs, fumaroles, steaming ground, mud pots, mud pools, mud volcanoes, or geysers. Other definitions:Wikipedia Reegle When geothermal systems have conduits available to the surface, they cause surface manifestations (or geothermal features). These features may vary between steam seeps (fumaroles) or pure fluid manifestations (geysers and hot springs) causing spectacular mineral formations (e.g. sinter terraces, tufa mounds). These types of manifestations are clear indications of an underlying geothermal system. Geothermal systems with no modern surface
Well-to-wheels analysis of energy use and greenhouse gas emissions of plug-in hybrid electric vehicles.
Plug-in hybrid electric vehicles (PHEVs) are being developed for mass production by the automotive industry. PHEVs have been touted for their potential to reduce the US transportation sector's dependence on petroleum and cut greenhouse gas (GHG) emissions by (1) using off-peak excess electric generation capacity and (2) increasing vehicles energy efficiency. A well-to-wheels (WTW) analysis - which examines energy use and emissions from primary energy source through vehicle operation - can help researchers better understand the impact of the upstream mix of electricity generation technologies for PHEV recharging, as well as the powertrain technology and fuel sources for PHEVs. For the WTW analysis, Argonne National Laboratory researchers used the Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) model developed by Argonne to compare the WTW energy use and GHG emissions associated with various transportation technologies to those associated with PHEVs. Argonne researchers estimated the fuel economy and electricity use of PHEVs and alternative fuel/vehicle systems by using the Powertrain System Analysis Toolkit (PSAT) model. They examined two PHEV designs: the power-split configuration and the series configuration. The first is a parallel hybrid configuration in which the engine and the electric motor are connected to a single mechanical transmission that incorporates a power-split device that allows for parallel power paths - mechanical and electrical - from the engine to the wheels, allowing the engine and the electric motor to share the power during acceleration. In the second configuration, the engine powers a generator, which charges a battery that is used by the electric motor to propel the vehicle; thus, the engine never directly powers the vehicle's transmission. The power-split configuration was adopted for PHEVs with a 10- and 20-mile electric range because they require frequent use of the engine for acceleration and to provide energy when the battery is depleted, while the series configuration was adopted for PHEVs with a 30- and 40-mile electric range because they rely mostly on electrical power for propulsion. Argonne researchers calculated the equivalent on-road (real-world) fuel economy on the basis of U.S. Environmental Protection Agency miles per gallon (mpg)-based formulas. The reduction in fuel economy attributable to the on-road adjustment formula was capped at 30% for advanced vehicle systems (e.g., PHEVs, fuel cell vehicles [FCVs], hybrid electric vehicles [HEVs], and battery-powered electric vehicles [BEVs]). Simulations for calendar year 2020 with model year 2015 mid-size vehicles were chosen for this analysis to address the implications of PHEVs within a reasonable timeframe after their likely introduction over the next few years. For the WTW analysis, Argonne assumed a PHEV market penetration of 10% by 2020 in order to examine the impact of significant PHEV loading on the utility power sector. Technological improvement with medium uncertainty for each vehicle was also assumed for the analysis. Argonne employed detailed dispatch models to simulate the electric power systems in four major regions of the US: the New England Independent System Operator, the New York Independent System Operator, the State of Illinois, and the Western Electric Coordinating Council. Argonne also evaluated the US average generation mix and renewable generation of electricity for PHEV and BEV recharging scenarios to show the effects of these generation mixes on PHEV WTW results. Argonne's GREET model was designed to examine the WTW energy use and GHG emissions for PHEVs and BEVs, as well as FCVs, regular HEVs, and conventional gasoline internal combustion engine vehicles (ICEVs). WTW results are reported for charge-depleting (CD) operation of PHEVs under different recharging scenarios. The combined WTW results of CD and charge-sustaining (CS) PHEV operations (using the utility factor method) were also examined and reported. According to the utility factor method, the share of veh
Elgowainy, A.; Han, J.; Poch, L.; Wang, M.; Vyas, A.; Mahalik, M.; Rousseau, A.
Into the Teeth of the Gale: The Remarkable Advance of a Cold Front at Grand Manan
The afternoon of 30 December 1962 saw the nearly simultaneous arrival at Grand Manan (an island in the Bay of Fundy) of an intense cold front, accompanied by northwesterly gales and snow, and an intense small cyclonic vortex, producing a mild ...
Robert M. Cunningham; Frederick Sanders
On the Formation of Potential-Vorticity Anomalies in Upper-Level Jet-Front Systems
We review and discuss a difference in interpretation of the role of turbulence in modifying the potential-vorticity distribution in the vicinity of upper-level jet-front systems. In the late 1970s, M. A. Shapiro presented observational evidence ...
Daniel Keyser; Richard Rotunno
Solar cells conversion efficiency maximisation based on sol-gel method and front surface texturisation
This paper presents experiments and evaluations on a new silicon solar cell structure obtained by texturisation of the front surface using silicon micromachining technologies. The textured surface of the solar cell is made in order to reduce frontal ... Keywords: light trapping, micromachining, silicon, sol-gel method, solar cells, texturisation
Lucian Milea; Orest Oltu; Claudius Teodorescu; Verona Muntean; Marius Stoian
The Energy Spectrum of Fronts: Time Evolution of Shocks in Burgers� Equation
Andrews and Hoskins used semigeostrophic theory to argue that the energy spectrum of a front should decay like the ?8/3 power of the wavenumber. They note, however, that their inviscid analysis is restricted to the very moment of breaking; that ...
John P. Boyd
Research Aircraft Observations and Numerical Simulations of a Warm Front Approaching Vancouver Island
The mesoscale structure of the low-level flow and the character of the turbulence are investigated for a warm front as it approached the prominent terrain of the Pacific Northwest in the vicinity of Vancouver Island. Flight-level and airborne ...
James D. Doyle; Nicholas A. Bond
Norwegian-Type and Cold Front Aloft�Type Cyclones East of the Rocky Mountains
Conventional data and mesoscale model simulations are used to analyze two cyclones that developed east of the Rocky Mountains in June and November 1998. Both cyclones formed when a Pacific cold front overtook a lee trough/dryline east of the ...
John D. Locatelli; Ralph D. Schwartz; Mark T. Stoelinga; Peter V. Hobbs
A six-year climatology of fronts affecting Helsinki, Finland and their boundary layer structure
A six-year climatology of the frequency, characteristics, and boundary-layer structure of synoptic-scale fronts in Helsinki, Finland was created using significant weather charts and observations from a 327 m tall mast and from the Station for ...
Research Article: Ranking of microRNA target prediction scores by Pareto front analysis
Over the past ten years, a variety of microRNA target prediction methods has been developed, and many of the methods are constantly improved and adapted to recent insights into miRNA-mRNA interactions. In a typical scenario, different methods return ... Keywords: MicroRNAs, Multi-objective optimisation, Pareto front, Target mRNAs
Sudhakar Sahoo; Andreas A. Albrecht
Unusually Long Duration, Multiple-Doppler Radar Observations of a Front in a Convective Boundary Layer
Dual-Doppler observations acquired by a network of mobile radars deployed in the Oklahoma panhandle on 3 June 2002 are used to document the kinematic structure and evolution of a front. The data were collected during the International H2O Project ...
John R. Stonitsch; Paul M. Markowski
The Influence of Canyon Winds on Flow Fields near Colorado's Front Range
A network of sodars was operated in the late summer and fall of 1993 to monitor the occurrence of nocturnal winds from a canyon in Colorado's Front Range near the Rocky Flats Plant and to determine the influence of those winds on the flow fields ...
J. C. Doran
Average crack front velocity during subcritical fracture propagation in a heterogeneous medium
the free energy, and thus the energy barrier, via numerous competing mech- anisms like stress corrosion speed of crack growth with increasing G; a weak stress- sensitive regime II follows where transportAverage crack front velocity during subcritical fracture propagation in a heterogeneous medium
Ampuero, Jean Paul
User-centric composition of service front-ends at the presentation layer
The emerge of web services in Service-Oriented Architectures (SOA) within companies or at the global internet offers new ways for the creation of web applications. Even though the composition of services via business processes are covered by existing ... Keywords: UI integration, service composition at the presentation layer, service front-ends
Tobias Nestler; Lars Dannecker; Andreas Pursche
Baroclinic Eady Wave and Fronts. Part I: Viscous Semigeostrophy and the Impact of Boundary Condition
A two-dimensional viscous semigeostrophic model is developed to study the evolution of the baroclinic Eady wave and fronts with two types (free-slip and nonslip) of boundary conditions. With the free-slip boundary condition, the solution is very ...
Qin Xu; Wei Gu; Jidong Gao
The Dependence of Canyon Winds on Surface Cooling and External Forcing in Colorado's Front Range
The atmospheric katabatic flow in the foothills of the Front Range of the Rocky Mountains has been monitored by a network of towers and sodars for several years as part of the ASCOT program. The dependence of the outflow from Coal Creek Canyon on ...
Richard L. Coulter; Paul Gudiksen
Silicon Solar Cells with Front Hetero-Contact and Aluminum Alloy Back Junction: Preprint
We prototype an alternative n-type monocrystalline silicon (c-Si) solar cell structure that utilizes an n/i-type hydrogenated amorphous silicon (a-Si:H) front hetero-contact and a back p-n junction formed by alloying aluminum (Al) with the n-type Si wafer.
to the mismatched conditions [15]. Adding white noise to the signal results in an constant addition to the log power the effect of additive noise distortion, white Gaussian noise is added to the speech signal and firstname.lastname@example.com ABSTRACT This paper presents an acoustic front-end which uses the properties of auditory masking
Light-front Holography - A New Approach to Relativistic Hadron Dynamics and Nonperturbative QCD
The holographic mapping of gravity in AdS space to QCD, quantized at fixed light-front time, provides a precise relation between the bound-state amplitudes in the fifth dimension of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. In particular, the elastic and transition form factors of the pion and the nucleons are well described in this framework. The light-front AdS/QCD holographic approach thus gives a frame-independent first approximation of the color-confining dynamics, spectroscopy, and excitation spectra of relativistic light-quark bound states in QCD. More generally, we show that the valence Fock-state wavefunctions of the eigensolutions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schroedinger equation, with an effective confining potential which systematically incorporates the effects of higher quark and gluon Fock states. The proposed method to compute the effective interaction thus resembles the two-particle-irreducible functional techniques used in quantum field theory.
de Teramond, Guy F.; Brodsky, Stanley J.
Mesoscale Energy Spectra of the Mei-Yu Front System. Part I: Kinetic Energy Spectra
The mesoscale kinetic energy (KE) spectra of the mei-yu front system are investigated through idealized numerical simulations. In the mature stage, the upper-tropospheric KE spectrum resembles a ?3 power law for wavelengths between 1000 and 400 km ...
Diabatic Effects on Late-Winter Cold Front Evolution: Conceptual and Numerical Model Evaluations
The impact of diabatic heating on late winter frontogenesis is evaluated both through conceptual scaling and the use of high-resolution Eta Model simulations of a strong but relatively dry cold surface front that occurred during the Storm-scale ...
Geographic Window Sizes Applied to Remote Sensing Sea Surface Temperature Front Detection
The effects of using a geographic window size with an existing edge-detection technique for the detection of thermal fronts in sea surface temperature (SST) imagery are investigated. The size of a geographic window is not constant but instead is ...
Scott F. Diehl; Judith W. Budd; David Ullman; Jean-Fran�ois Cayula
Eastgate seen from the south-east, in front of Harare's glass and concrete towers
Eastgate seen from the south-east, in front of Harare's glass and concrete towers #12;Eastgate officesEastgate offices Level two #12;Sections showing the passive cooling system #12;Cooling the office the degree of internal cooling achieved during April 1998 #12;· The termitary model · The termitary is an i f
Behmer, Spencer T.
The Three-Dimensional Circulation near the Eastern North pacific Subtropical Front
The purpose of our study is to describe and compute the large-scale, three-dimensional circulation near the Subtropical Front in the eastern North Pacific along 31�N. This was accomplished through the use of four extensive hydrographic surveys, ...
Pearn P. Niller; Richard W. Reynolds
Some Two-Layer Models of the Shelf-Slope Front: Geostrophic Adjustment and its Maintenance
Two conceptual models of a two-layered frontal system are presented to study the wintertime shelf-slope front. The first model examines the geostrophic adjustment over a step topography after the fall overturning and applies only over short time ...
A Modeling Case Study of Heavy Rainstorms along the Mei-Yu Front
On 12�13 June 1991, a series of convective rainstorms (defined as mesoscale precipitation systems with rainfall rates exceeding 10 mm h?1) developed successively along the Mei-Yu front. During this event, new rainstorms formed to the east of ...
Shou-Jun Chen; Ying-Hwa Kuo; Wei Wang; Zu-Yu Tao; Bo Cui
Dehumidification and simultaneous removal of selected pollutants from indoor air by a desiccant wheel using a 1M type desiccant
Solid-desiccant dehumidifiers are increasingly becoming an integral part of desiccant based air-conditioning systems because of their effective handling of latent heat loads compared to conventional vapor compression units. In these units, either a silica gel or a molecular sieve is used for dehumidification of air. Both of them have the capability to co-adsorb various chemical pollutants during dehumidification of air. However, the shape of the isotherm for water vapor on these materials is not favorable for desiccant cooling applications. A mixture (1M desiccant) containing a silica gel, a molecular sieve, and a hydrophobic molecular sieve that was coated on an aluminum foil was studied for its capability for simultaneous removal of moisture and some selected pollutants from air. Experimental data were obtained in a fixed bed adsorber that simulated the operation of a rotary desiccant wheel. Air to be dehumidified and cleaned and the hot regeneration air were cycled in a specific time interval through this bed. The shape of the water isotherm on 1M desiccant was found to be in between that of silica gel and molecular sieve 13{times}, but its uptake capacity was significantly lower than that of either silica gel or molecular sieve. A flow rate of about 100 L/min that provided a face velocity of about 132 cm/s was used in the adsorption step. The flow rate during regeneration was about 50 L/min. The temperature of the inlet air was about 23 C and its relative humidity was varied between 20% and 80%. The concentrations of pollutants were as follows; carbon dioxide: 1050 and 2300 ppm; toluene: 32 ppm; 1,1,1-trichloroethane: 172 ppm, and formaldehyde: 0.35 ppm. A complete breakthrough of all the pollutants was observed during an adsorption cycle.
Popescu, M.; Ghosh, T.K. [Univ. of Missouri, Columbia, MO (United States)
Feature Tracking on the Unit Sphere
Techniques used in a previous study of the objective identification and tracking of meteorological features in model data are extended to the unit sphere. An alternative feature detection scheme is described based on cubic interpolation for the ...
K. I. Hodges
Transfer in Reinforcement Learning via Shared Features
We present a framework for transfer in reinforcement learning based on the idea that related tasks share some common features, and that transfer can be achieved via those shared features. The framework attempts to capture ...
Konidaris, George
Feature Tracking Using Reeb Graphs
Tracking features and exploring their temporal dynamics can aid scientists in identifying interesting time intervals in a simulation and serve as basis for performing quantitative analyses of temporal phenomena. In this paper, we develop a novel approach for tracking subsets of isosurfaces, such as burning regions in simulated flames, which are defined as areas of high fuel consumption on a temperature isosurface. Tracking such regions as they merge and split over time can provide important insights into the impact of turbulence on the combustion process. However, the convoluted nature of the temperature isosurface and its rapid movement make this analysis particularly challenging. Our approach tracks burning regions by extracting a temperature isovolume from the four-dimensional space-time temperature field. It then obtains isosurfaces for the original simulation time steps and labels individual connected 'burning' regions based on the local fuel consumption value. Based on this information, a boundary surface between burning and non-burning regions is constructed. The Reeb graph of this boundary surface is the tracking graph for burning regions.
Weber, Gunther H.; Bremer, Peer-Timo; Day, Marcus S.; Bell, John B.; Pascucci, Valerio
Mesoscale Thermohaline, Sound Velocity and Baroclinic Flow Structure of the Pacific Subtropical Front During the Winter of 1980
The three-dimensional thermohaline. sound velocity and baroclinic flow structure of the. pacific sub-tropical front during January and February 1990 are discussed. The front is meander-like, with a wavelength of 180 km, a wave amplitude of 55 km, ...
Gunnar I. Roden
The Formation and Maintenance of Density Fronts on the U.S. Southeastern Continental Shelf during Winter
Density fronts on the U.S. southeastern continental shelf, during winter, am formed by (i) breakdown of the shelf-break front by Gulf Stream meanders or strong southward winds or both, (ii) shoreward intrusion of upper Gulf Stream warm water by ...
Lie-Yauw Oey
Power efficient asynchronous multiplexer for X-ray sensors in medical imaging analog front-end electronics
This paper presents a new power efficient asynchronous multiplexer (MUX) for application in analog front-end electronics (AFE) used in X-ray medical imaging systems. Contrary to typical synchronous MUXes that have to be controlled by a clock, this circuit ... Keywords: Analog front end, Asynchronous circuits, Medical imaging, Multiplexers, X-ray detection
Rafa? D?ugosz; Pierre-Andr� Farine; Kris Iniewski
Survey of Morphologies Formed in the Wake of an Enslaved Phase-Separation Front in Two Dimensions
A phase-separation front will leave in its wake a phase-separated morphology that differs markedly from homogeneous phase-separation morphologies. For a purely diffusive system such a front, moving with constant velocity, will generate very regular, non-equilibrium structures. We present here a numerical study of these fronts using a lattice Boltzmann method. In two dimensions these structures are regular stripes or droplet arrays. In general the kind and orientation of the selected morphology and the size of the domains depends on the speed of the front as well as the composition of the material overtaken by the phase-separation front. We present a survey of morphologies as a function of these two parameters. We show that the resulting morphologies are initial condition dependent. We then examine which of the potential morphologies is the most stable. An analytical analysis for symmetrical compositions predicts the transition point from orthogonal to parallel stripes.
E. M. Foard; A. J. Wagner
Small Mesoscale Features at a Meandering Upper-Ocean Front in the Western Ionian Sea (Mediterranean Sea): Vertical Motion and Potential Vorticity Analysis
Transient mesoscale and submesoscale processes, such as small eddies and filaments, could play a fundamental role in the marine ecosystem, especially in oligotrophic seas like the Mediterranean. However, very little is known about the biological ...
Bruno Buongiorno Nardelli; Rosalia Santoleri; Stefania Sparnocchia
Relict Geothermal Features | Open Energy Information
Relict Geothermal Features Relict Geothermal Features Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Relict Geothermal Features Dictionary.png Relict Geothermal Features: No definition has been provided for this term. Add a Definition Relict geothermal surface feature, include the mineral formations left behind by hot springs, fumaroles, and geysers as well as the alteration of minerals by geothermal waters (e.g. opalization of sediments). Such alteration and deposits are indicators of past hydrothermal activity. Though surface activity has ceased in many areas, relict geothermal features may indicate the presence of a still active geothermal system below the surface. Retrieved from "http://en.openei.org/w/index.php?title=Relict_Geothermal_Features&oldid=600720"
Hydrogen Pathways: Updated Cost, Well-to-Wheels Energy Use, and Emissions for the Current Technology Status of Ten Hydrogen Production, Delivery, and Distribution Scenarios
This report describes a life-cycle assessment conducted by the National Renewable Energy Laboratory (NREL) of 10 hydrogen production, delivery, dispensing, and use pathways that were evaluated for cost, energy use, and greenhouse gas (GHG) emissions. This evaluation updates and expands on a previous assessment of seven pathways conducted in 2009. This study summarizes key results, parameters, and sensitivities to those parameters for the 10 hydrogen pathways, reporting on the levelized cost of hydrogen in 2007 U.S. dollars as well as life-cycle well-to-wheels energy use and GHG emissions associated with the pathways.
Ramsden, T.; Ruth, M.; Diakov, V.; Laffen, M.; Timbario, T. A.
Temperature Equilibration Behind the Shock Front: an Optical and X-ray Study of RCW 86
We study the electron-proton temperature equilibration behind several shocks of the RCW 86 supernova remnant. To measure the proton temperature, we use published and new optical spectra, all from different locations on the remnant. For each location, we determine the electron temperature from X-ray spectra, and correct for temperature equilibration between the shock front and the location of the X-ray spectrum. We confirm the result of previous studies that the electron and proton temperatures behind shock fronts are consistent with equilibration for slow shocks and deviate for faster shocks. However, we can not confirm the previously reported trend of the electron temperature to proton temperature ratio of 1/v^2.
Helder, E A; Bassa, C G
We study the electron-proton temperature equilibration behind several shocks of the RCW 86 supernova remnant. To measure the proton temperature, we use published and new optical spectra, all from different locations on the remnant. For each location, we determine the electron temperature from X-ray spectra, and correct for temperature equilibration between the shock front and the location of the X-ray spectrum. We confirm the result of previous studies that the electron and proton temperatures behind shock fronts are consistent with equilibration for slow shocks and deviate for faster shocks. However, we cannot confirm the previously reported trend of T{sub e}/T{sub p}{proportional_to}1/v{sup 2}{sub s}.
Helder, E. A.; Vink, J. [Astronomical Institute, Utrecht University, P.O. Box 80000, NL-3508 TA Utrecht (Netherlands); Bassa, C. G., E-mail: firstname.lastname@example.com [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL (United Kingdom)
Front cover
INVESTMENT IN COMMODITIES MARKETS: INVESTMENT IN COMMODITIES MARKETS: POTENTIAL IMPACT ON COMMODITY PRICES & VOLATILITY IIF Commodities Task Force Submission to the G20 September 2011 IIF Commodities Task Force Submission to the G20 Financial Investment in Commodity Markets: Potential Impact on Commodity Prices & Volatility 1 Preface Amidst increasing concerns about global growth prospects and financial market volatility, commodity prices con- tinue to be a focus for policymakers. The French G-20 presidency has made this topic a priority, emphasizing the potential role of financial investment in driving trends in commodity markets. With commodity prices closely linked to inflation trends, particularly in low-income countries where food security is a vital issue, the search for policy tools
Front Matter
and 1976, Rhodesia's oil import costs trebled. To financethe regular price for oil. This extra cost for purchasing onand the oil price increase w~re deepened by the cost of
I am delighted to have the honour to introduce the Proceedings of the Nineteenth European Conference on Artificial Intelligence (ECAI-2010), including the proceedings of the Sixth Conference on Prestigious Applications of Intelligent Systems (PAIS-2010). ...
The 12th International Conference on Artificial Intelligence in Education (AIED-2005) is being held July 18--22, 2005, in Amsterdam, the beautiful Dutch city near the sea. AIED-2005 is the latest in an on-going series of biennial conferences in AIED ...
Section: Front
GEWEX. One of these joint planning activities culminated in the field deployment of the Pilot Radiation Observation Experiment (PROBE) to Kavieng, Papua New Guinea, as part of...
Black Studies. Yashpa l A. Tandon, Ph.D. (London). FormerlyMUSEVENTSGOVERNMENT Yash Tandon THE RISE AND FALL OF TilE1964 a.r 1973, Dr. Tandon was Reader in the Depanment of
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Property:TopoFeatures | Open Energy Information
Property Property Edit with form History Facebook icon Twitter icon » Property:TopoFeatures Jump to: navigation, search Property Name TopoFeatures Property Type String Description Describes topographic features within the vicinity of the field (e.g. volcanic features, rift valleys, extensional features) that may be significant reflections of underlying geothermal resources. This is a property of type Page. Subproperties This property has the following 4 subproperties: G Geysers Geothermal Area L Lightning Dock Geothermal Area S Soda Lake Geothermal Area Stillwater Geothermal Area Pages using the property "TopoFeatures" Showing 23 pages using this property. A Amedee Geothermal Area + Horst and Graben + B Beowawe Hot Springs Geothermal Area + Horst and Graben +
Spatial Feature Evaluation for Aerial Scene Analysis
High-resolution aerial images are becoming more readily available, which drives the demand for robust, intelligent and efficient systems to process increasingly large amounts of image data. However, automated image interpretation still remains a challenging problem. Robust techniques to extract and represent features to uniquely characterize various aerial scene categories is key for automated image analysis. In this paper we examined the role of spatial features to uniquely characterize various aerial scene categories. We studied low-level features such as colors, edge orientations, and textures, and examined their local spatial arrangements. We computed correlograms representing the spatial correlation of features at various distances, then measured the distance between correlograms to identify similar scenes. We evaluated the proposed technique on several aerial image databases containing challenging aerial scene categories. We report detailed evaluation of various low-level features by quantitatively measuring accuracy and parameter sensitivity. To demonstrate the feature performance, we present a simple query-based aerial scene retrieval system.
Swearingen, Thomas S [ORNL] [ORNL; Cheriyadat, Anil M [ORNL] [ORNL
Parametric Study of Front-End Nuclear Fuel Cycle Costs Using Reprocessed Uranium
This study evaluates front-end nuclear fuel cycle costs assuming that uranium recovered during the reprocessing of commercial light-water reactor (LWR) spent nuclear fuel is available to be recycled and used in the place of natural uranium. This report explores the relationship between the costs associated with using a natural uranium fuel cycle, in which reprocessed uranium (RepU) is not recycled, with those associated with using RepU.
Mapping Neutral Hydrogen During Reionization with the Ly-alpha Emission from Quasar Ionization Fronts
We present a new method to directly map the neutral-hydrogen distribution during the reionization epoch and to constrain the emission properties of the highest-redshift quasars (QSOs). As a tracer of HI, we propose to use the Ly-alpha radiation produced by quasar ionization fronts (I-fronts) that expand in the partially ionized intergalactic medium (IGM) before reionization is complete. These Ly-alpha photons are mainly generated by collisional excitations of hydrogen atoms in the boundary of the rapidly expanding HII region. The observable signal is produced by the part of the I-front that lies behind the QSO with respect to the observer. Combining two radiative transfer models (one for the QSO ionizing radiation and one for the Ly-alpha photons), we estimate the expected Ly-alpha spectral shape and surface brightness (SB) for a large number of configurations where we varied both the properties of the ionizing QSO and of the surrounding medium. We find that the expected signal is observable as a single (broad) emission line with a characteristic width of 100-200 km/s. The expected SB produced at redshift z~6.5 within a fully neutral region (at mean density) by a typical QSO I-front lies in the range $10^{-21}-10^{-20}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$ and decreases proportionally to $(1+z)^2$ for a given QSO age. QSOs with harder spectra may produce a significantly brighter emission at early phases. The signal may cover up to a few hundred square arcmin on the sky and should be already detectable with current facilities by means of moderate/high resolution spectroscopy. The detection of this Ly-alpha emission can shed new light on the reionization history, the age and the emission properties of the highest-redshift QSOs. (abridged)
Sebastiano Cantalupo; Cristiano Porciani; Simon J. Lilly
Program on Technology Innovation: Small Torrefaction Plants Front End Engineering and Design
This report is produced under the EPRI Program on Technology Innovation, and analyzes the viability of developing small torrefaction plants, to be locally deployed close to biomass resource areas, to reduce logistic cost associated to hauling wet raw biomass long distances to large centralized facilities, for production of torrefied chips and pellets. Two plant sizes were selected for a Front Engineering and Design Analysis: 1) A 5/tons/hour product capacity and 2) a 2tons/hour product capacity. The torr...
High-Level Synthesis of Analog Sensor Interface Front-Ends
In this paper we compare three different methodologies for analog high-level synthesis. Two optimization-based methods-one with simulations in the loop, the other with equations-and a library-based approach are discussed and illustrated with experimental ... Keywords: sensors, analog high-level synthesis, analog sensor interface front-ends, optimization-based methods, library-based approach, radiation detector interface ASIC
S. Donnay; G. Gielen; W. Sansen; W. Kruiskamp; D. Leenaerts; W. Van Bokhoven
Water treatment on wheels
Design options and combinations of fixed and mobile demineralization equipment give power plant operators the flexibility to continually optimize their water treatment system to meet rapidly changing needs. The article classifies water treatment service contracts for demineralized water into four categories and presents associated design, economic and operational advantages to power plant designers, constructors, owners and operators. 1 tab.
Taylor, R.T.
Away from the Range Front: Intra-Basin Geothermal Exploration Geothermal
Away from the Range Front: Intra-Basin Geothermal Exploration Geothermal Away from the Range Front: Intra-Basin Geothermal Exploration Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Away from the Range Front: Intra-Basin Geothermal Exploration Project Type / Topic 1 Recovery Act: Geothermal Technologies Program Project Type / Topic 2 Validation of Innovative Exploration Technologies Project Description The project applies the known relationship between fault permeability and the mechanics of rocks under stress to reduce risks in exploration well targeting. Although the concept has been applied before, the project would innovate by dramatically increasing the detail and types of information on the mechanical state of the target area using a variety of low-cost measurements in advance of deep drilling. In addition to the mechanical data, holes into the shallow warm aquifer related to the thermal anomaly will allow analysis of chemical indicators of upflow as a more direct measure of the location of fault permeability.
Thermomechanical analysis of high-heat-load components for the canted-undulator front end.
With the canted undulators operating at 200 mA at closed gap at the Advanced Photon Source in the future, the front end will receive 20.4 kW of total power and 281 kW/mrad{sup 2} of peak power density. Thermal analysis of the front-end high-heat-load components becomes an essential part of the front-end design. An extensive study has been conducted on the thermal design of the photon shutters and fixed masks. A unique dog-bone-shaped cross-section design for the photon shutters was derived to relieve high stress in the corners. The dual-undulator x-ray beams were simulated at several locations on the fixed mask to ensure the worst possible case is considered. Stress analysis on the fixed mask revealed that the maximum stress occurs when beam hits the intersection between the horizontal surface and the corner surface. The details of the analysis procedure are presented, and the failure criteria are discussed.
Jaski, Y.; Trakhtenberg, E.; Collins, J.; Benson, C.; Brajuskovic, B.; Den Hartog, P.
ARM - Feature Stories and Releases Article
July 26, 2012 Feature Stories and Releases Capturing Aerosol Evolution at Cape Cod From July 2012 to June 2013, nearly sixty instruments are obtaining atmospheric data from the...
9 Feature Stories and Releases Open House Draws Crowd to ARM Climate Research Facility Display Mild summer temperatures helped bring thousands of visitors through the gates of...
features the familiar faces of Professor Polar Bear, Teacher Turtle, and PI Prairie Dog. These "mascots" represent the ARM Climate Research Facility's research locales in...
December 11, 2007 Feature Stories and Releases National User Facility Leads to Multidisciplinary Climate Research Contact: Lynne Roeder, ARM Public Information Officer,...
Facility News, Feature Stories and Releases Research Flights Completed for Biomass Burning Field Campaign Bookmark and Share The Gulstream-1 heads toward a smoke plume during a...
Identifying Transition State Features of Enzymatic Conformational...
remains a challenging task. We employ computational strategies in conjunction with NMR experiments to reveal - in atomistic resolution - features of transition states and...
March 31, 2008 Feature Stories and Releases Aerosols and Clouds: A Complex Climate Connection New data will help researchers examine cloud composition and resulting effects on...
Digital Mapping Of Structurally Controlled Geothermal Features...
Gps Units And Pocket Computers Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Digital Mapping Of Structurally Controlled Geothermal Features With...
GPS Units And Pocket Computers Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Digital Mapping Of Structurally Controlled Geothermal Features...
The Eastern United States Side-Door Cold Front of 22 April 1987: A Case Study of an Intense Atmospheric Density Current
A case study is presented of an unusual cold front that affected the east coast of the United States on 22 April 1987. Noteworthy aspects of this front are its genesis behind a preexisting back-door cold front its propagation to the southwest, ...
Gregory J. Hakim
Web credibility: features exploration and credibility prediction
The open nature of the World Wide Web makes evaluating webpage credibility challenging for users. In this paper, we aim to automatically assess web credibility by investigating various characteristics of webpages. Specifically, we first identify features ... Keywords: classification, feature analysis, regression, web credibility
Alexandra Olteanu; Stanislav Peshterliev; Xin Liu; Karl Aberer
We present a framework for transfer in reinforcement learning based on the idea that related tasks share some common features, and that transfer can be achieved via those shared features. The framework attempts to capture the notion of tasks that are ...
George Konidaris; Ilya Scheidwasser; Andrew Barto
Archives and History Office: Short Features
Features > Short Features Features > Short Features Short Features in SLAC History 40th SLAC celebrated its 40th Anniversary in 2002 with a series of events and a photo book. 50th SLAC celebrated its 50th Anniversary in 2012 with a series of events and a special anniversary website: Celebrating 50 Years of Discovery. APS Burton Richter, Sid Drell , Martin Perl , and Herman Winick made presentations at the American Physical Society (APS) Centennial Celebration and Meeting ( March 20-26 1999). Angiogram The first synchrotron radiation coronary angiogram recorded on a human subject occurred in May 1986 at the Stanford Synchrotron Radiation Laboratory (SSRL). BaBar BaBar was dedicated on August 13, 1999. Beam Trees Beam trees are not actually beams or trees. Blue Book The Blue Book is a SLAC classic written to document for posterity the design and building of SLAC's two-mile accelerator. Available in full-text from the SLAC Library.
The Subpolar Front of the Japan/East Sea. Part II: Inverse Method for Determining the Frontal Vertical Circulation
An inverse method for inferring vertical velocities from high-resolution hydrographic/velocity surveys is formulated and applied to observations collected at the subpolar front of the Japan/East Sea (JES) taken during several cold-air outbreaks. ...
Leif N. Thomas; Craig M. Lee; Yutaka Yoshikawa
Mapping and Monitoring Large-Scale Ocean Fronts Off the California Coast Using Imagery from the GOES-10 Geostationary Satellite
2002. New old frontier: ocean fronts (Editorial). Dyn.Atmos. Oceans 36:1�2. Bernstein, R.L. , L.C. Breaker, and R.satellite imagery of the oceans. IEEE Trans. Geosci. Remote
Breaker, Laurence C.; Mavor, Timothy P.; Broenkow, William W.
A Nonclassical Cold Front Observed during COPS-91: Frontal Structure and the Process of Severe Storm Initiation
This case study addresses the issue of gravity current and bore development at surface cold fronts, and the role of these phenomena in the generation of severe frontal convection. The event investigated occurred on 27 April 1991 during the ...
Steven E. Koch; Wallace L. Clark
The 12/13 January 1988 Narrow Cold-Frontal Rainband Observed during MFDP/FRONTS 87. Part II: Microphysics
The microphysics of a narrow cold-frontal rainband (NCFR) observed during the MFDP/FRONTS87 experiment is investigated by using a microphysical retrieval model. The equations of evolution of the water substance and of the temperature are solved ...
Virginie Mar�cal; Dani�le Hauser; Frank Roux
Relevance of Surface Energy Budget within Florida Sea-Breeze Front to Cross-Peninsula Rainwater Runoff Gradient
Analysis of surface latent heat flux measurements taken within the sea-breeze front of the coast of Florida during active thunderstorm periods demonstrates an important effect of the timing of coastal storms on the seasonal surface water budget. ...
Harry J. Cooper; Eric A. Smith; Michael T. Rubes
The structure of a combustion front propagating in a fixed bed of crushed oil shale : co-current configuration.
??La propagation d'un front de combustion au sein d'un milieu poreux r�actif met en �uvre des m�canismes thermiques, chimiques et de transfert, avec de forts� (more)
Ferreira Martins, Marcio
The Influence of Sea Surface Temperature Gradients on Stratiform Cloudiness along the Equatorial Front in the Pacific Ocean
Satellite observations of visible cloudiness and sea surface temperature (SST) are used to test the hypothesis that the configuration of cool low-level winds blowing across a sharp SST front in the equatorial eastern Pacific gives rise to ...
Clara Deser; Susan Wahl; John J. Bates
A comparison of automated methods of front recognition for climate studies � a case study in south west Western Australia
The identification of extratropical fronts in reanalyses and climate models is an important climate diagnostic that aids dynamical understanding and model verification. This study compares six frontal identification methods which are applied to ...
Pandora Hope; Kevin Keay; Michael Pook; Jennifer Catto; Ian Simmonds; Graham Mills; Peter McIntosh; James Risbey; Gareth Berry
Cold Air Damming by the Front Range of the Colorado Rockies and its Relationship to Locally Heavy Snows
Heavy snowstorms occur regularly along Colorado's Front Range and cause significant economic and human consequences for the urban corridor from Denver to Fort Collins. This paper examines one type of winter storm that displays great variability ...
Lawrence Dunn
Modification of the Thermodynamic Structure of the Lower Troposphere by the Evaporation of Precipitation ahead of a Cold Front
The evolution of an oceanic prefrontal subcloud layer of continental origin was examined by analyzing data gathered on the subsynoptic and mesoscale during Phase III of the Australian Cold Fronts Research Program. Characteristics of the ...
B. F. Ryan; K. J. Wilson; E. J. Zipser
Is a Cold Pool Necessary for the Maintenance of a Squall Line Produced by a Cold Front Aloft?
On 19�20 June 1979 a cyclone moved through the central United States. This cyclone contained a squall line associated with a cold front aloft (CFA), which caused significant damage. The fifth-generation Pennsylvania State University�NCAR ...
Mark T. Stoelinga; John D. Locatelli; Ralph D. Schwartz; Peter V. Hobbs
Well-to-wheels energy use and greenhouse gas emissions analysis of plug-in hybrid electric vehicles.
Researchers at Argonne National Laboratory expanded the Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) model and incorporated the fuel economy and electricity use of alternative fuel/vehicle systems simulated by the Powertrain System Analysis Toolkit (PSAT) to conduct a well-to-wheels (WTW) analysis of energy use and greenhouse gas (GHG) emissions of plug-in hybrid electric vehicles (PHEVs). The WTW results were separately calculated for the blended charge-depleting (CD) and charge-sustaining (CS) modes of PHEV operation and then combined by using a weighting factor that represented the CD vehicle-miles-traveled (VMT) share. As indicated by PSAT simulations of the CD operation, grid electricity accounted for a share of the vehicle's total energy use, ranging from 6% for a PHEV 10 to 24% for a PHEV 40, based on CD VMT shares of 23% and 63%, respectively. In addition to the PHEV's fuel economy and type of on-board fuel, the marginal electricity generation mix used to charge the vehicle impacted the WTW results, especially GHG emissions. Three North American Electric Reliability Corporation regions (4, 6, and 13) were selected for this analysis, because they encompassed large metropolitan areas (Illinois, New York, and California, respectively) and provided a significant variation of marginal generation mixes. The WTW results were also reported for the U.S. generation mix and renewable electricity to examine cases of average and clean mixes, respectively. For an all-electric range (AER) between 10 mi and 40 mi, PHEVs that employed petroleum fuels (gasoline and diesel), a blend of 85% ethanol and 15% gasoline (E85), and hydrogen were shown to offer a 40-60%, 70-90%, and more than 90% reduction in petroleum energy use and a 30-60%, 40-80%, and 10-100% reduction in GHG emissions, respectively, relative to an internal combustion engine vehicle that used gasoline. The spread of WTW GHG emissions among the different fuel production technologies and grid generation mixes was wider than the spread of petroleum energy use, mainly due to the diverse fuel production technologies and feedstock sources for the fuels considered in this analysis. The PHEVs offered reductions in petroleum energy use as compared with regular hybrid electric vehicles (HEVs). More petroleum energy savings were realized as the AER increased, except when the marginal grid mix was dominated by oil-fired power generation. Similarly, more GHG emissions reductions were realized at higher AERs, except when the marginal grid generation mix was dominated by oil or coal. Electricity from renewable sources realized the largest reductions in petroleum energy use and GHG emissions for all PHEVs as the AER increased. The PHEVs that employ biomass-based fuels (e.g., biomass-E85 and -hydrogen) may not realize GHG emissions benefits over regular HEVs if the marginal generation mix is dominated by fossil sources. Uncertainties are associated with the adopted PHEV fuel consumption and marginal generation mix simulation results, which impact the WTW results and require further research. More disaggregate marginal generation data within control areas (where the actual dispatching occurs) and an improved dispatch modeling are needed to accurately assess the impact of PHEV electrification. The market penetration of the PHEVs, their total electric load, and their role as complements rather than replacements of regular HEVs are also uncertain. The effects of the number of daily charges, the time of charging, and the charging capacity have not been evaluated in this study. A more robust analysis of the VMT share of the CD operation is also needed.
Elgowainy, A.; Burnham, A.; Wang, M.; Molburg, J.; Rousseau, A.; Energy Systems
Well-balanced bicharacteristic-based scheme for multilayer shallow water flows including wet/dry fronts
The aim of this paper is to present a new well-balanced finite volume scheme for two-dimensional multilayer shallow water flows including wet/dry fronts. The ideas, presented here for the two-layer model, can be generalized to a multilayer case in a ... Keywords: Bicharacteristics, Evolution galerkin, Finite volume method, Two-layer shallow water, Well-balance, Wet/dry front
M. Dudzinski; M. Luk�?Ov�-Medvid'Ov�
Nature climate change features Los Alamos forest research
Nature climate change features forest research Nature climate change features Los Alamos forest research The print issue features as its cover story the tree-stress research of...
Passive Safety Features for Small Modular Reactors
The rapid growth in the size and complexity of commercial nuclear power plants in the 1970s spawned an interest in smaller, simpler designs that are inherently or intrinsically safe through the use of passive design features. Several designs were developed, but none were ever built, although some of their passive safety features were incorporated into large commercial plant designs that are being planned or built today. In recent years, several reactor vendors are actively redeveloping small modular reactor (SMR) designs with even greater use of passive features. Several designs incorporate the ultimate in passive safety they completely eliminate specific accident initiators from the design. Other design features help to reduce the likelihood of an accident or help to mitigate the accident s consequences, should one occur. While some passive safety features are common to most SMR designs, irrespective of the coolant technology, other features are specific to water, gas, or liquid-metal cooled SMR designs. The extensive use of passive safety features in SMRs promise to make these plants highly robust, protecting both the general public and the owner/investor. Once demonstrated, these plants should allow nuclear power to be used confidently for a broader range of customers and applications than will be possible with large plants alone.
Ingersoll, Daniel T [ORNL
A thousand words: themes and trends in home front poster propaganda of the second world war
Poster propaganda is one of the most memorable and enduring legacies of the Second World War. These artistic creations were strongly influenced by social and cultural paradigms as well as corresponding military events. Previous scholarship on propaganda has largely overlooked the role of posters and propaganda efforts on the home front, a gap that this study seeks to fill. The purpose of this study is to compare home front posters produced by the major nations involved in the European theatre and discern any trends or patterns that have a larger significance. Each poster in the sample was arranged chronologically by country. The area of emphasis (recruiting, production, etc.) and appeal (duty, guilt, fear, hate, etc.) for each poster was then recorded and analyzed. The analyses revealed several significant trends and patterns. The most important of these is that posters, regardless of which country produced them, tended to appeal to negative emotions (hate, fear, etc.) when the war was going badly and positive emotions (patriotism, duty, etc.) when the war was being won. Even when the areas of emphasis remained the same, the images, rhetoric and overall emotional tone of posters changed depending on the corresponding war situation. In other words, what a government said was not always as important as how they said it. This trend is equally significant today. Although posters have disappeared as a major propaganda tool, nations still fight wars and still carry out propaganda campaigns, therefore, if relationship between propaganda and the conduct of war presented in this study is applied to modern campaigns it provides the public with information that propaganda intends to keep secret: the truth about the war. Previous scholarship has mentioned this connection between propaganda methods and military operations, but as previously mentioned, these studies neglect both the home front and the poster, choosing to focus on propaganda directed at the enemy. Other patterns, such as the use of humor and religion in posters, are briefly touched on and provide possible areas for future research.
Thomas, Christopher C.
ARM - 2012 AMS Presentations Featuring ARM Data
2 AMS Presentations Featuring ARM Data 2 AMS Presentations Featuring ARM Data Media Contact Lynne Roeder lynne-dot-roeder-at-pnnl-dot-gov @armnewsteam Field Notes Blog Topics Field Notes89 AGU 3 AMIE 10 ARM Aerial Facility 2 ARM Mobile Facility 1 6 ARM Mobile Facility 2 47 BAECC 1 BBOP 4 MAGIC 12 MC3E 17 SGP 2 STORMVEX 29 TCAP 3 Search News Search Blog News Center All Categories What's this? Social Media Guidance News Center All Categories Features and Releases Facility News Field Notes Blog feed Events feed Employment Research Highlights Data Announcements Education News Archive What's this? Social Media Guidance 2012 AMS Presentations Featuring ARM Data Monday, January 23 Presentation Type Session ID and Presentation Title Presenters Time and Location Oral Invited J2.1, Next-Generation Global Precipitation Data for Hydrometeorogical Applications Arthur Y. Hou, Dalia Bach Kirschbaum 11:00 AM, 256
LEDSGP/tools/features | Open Energy Information
LEDSGP/tools/features LEDSGP/tools/features < LEDSGP | tools Jump to: navigation, search LEDSGP Logo.png Advancing climate-resilient low emission development around the world Home About Tools Expert Assistance Events Publications Join Us Tools Activities Inventory LEDS Toolkits Knowledge Portals Featured Tools Featured Tools The following resources can be used to support different stages of low emissions development planning. Click here to add a capacity building or training resource to the inventory. Webinar on Development Impact Assessment for Low Emissions Development: As part of this webinar, several members of the LEDS Global Partnership set out to review existing approaches to capturing and communicating development benefits of climate action and propose a new tool for communicating development benefits to policy makers as part of a LEDS
ARM - 2013 AMS Presentations Featuring ARM Data
3 AMS Presentations Featuring ARM Data 3 AMS Presentations Featuring ARM Data Media Contact Lynne Roeder lynne-dot-roeder-at-pnnl-dot-gov @armnewsteam Field Notes Blog Topics Field Notes89 AGU 3 AMIE 10 ARM Aerial Facility 2 ARM Mobile Facility 1 6 ARM Mobile Facility 2 47 BAECC 1 BBOP 4 MAGIC 12 MC3E 17 SGP 2 STORMVEX 29 TCAP 3 Search News Search Blog News Center All Categories What's this? Social Media Guidance News Center All Categories Features and Releases Facility News Field Notes Blog feed Events feed Employment Research Highlights Data Announcements Education News Archive What's this? Social Media Guidance 2013 AMS Presentations Featuring ARM Data Sunday, January 6 Presentation Type Session ID and Presentation Title Presenters Time and Location Poster Sessions Poster S150 Analysis of SPartiCus Data for Cirrus Modeling Case Studies R. L. Atlas, A. M. Fridlind and M. Diao 2:30-4:00 PM, Exhibit Hall 3
ARM - AGU Presentations Featuring ARM Data
CenterAGU Presentations Featuring ARM Data CenterAGU Presentations Featuring ARM Data Media Contact Lynne Roeder lynne-dot-roeder-at-pnnl-dot-gov @armnewsteam Field Notes Blog Topics Field Notes89 AGU 3 AMIE 10 ARM Aerial Facility 2 ARM Mobile Facility 1 6 ARM Mobile Facility 2 47 BAECC 1 BBOP 4 MAGIC 12 MC3E 17 SGP 2 STORMVEX 29 TCAP 3 Search News Search Blog News Center All Categories What's this? Social Media Guidance News Center All Categories Features and Releases Facility News Field Notes Blog feed Events feed Employment Research Highlights Data Announcements Education News Archive What's this? Social Media Guidance AGU Presentations Featuring ARM Data Monday, December 13 Presentation Type Session ID and Presentation Title Presenters Time and Location A11H. Atmospheric Sciences General Contributions: Clouds and Aerosol-Cloud Interactions I
Multimedia Semantic Features and Image Content Description
Content-based indexing and retrieval of images and video requires a proper semantic description for image content. This paper discusses the mapping of high-level, application-specific, features to the visual primitives that are accessible through image ...
M. Cavazza; R. J. Green; I. J. Palmer
August 17, 2009 Feature Stories and Releases The Air is Rare Up There Science team ascends nearly to height of Everest's base camp for atmospheric data Dave Turner (left) and...
December 7, 2010 Feature Stories and Releases User Facility Highlights at 2010 AGU Fall Meeting Scientists from around the world use data from the U.S. Department of Energy's...
10, 2009 Facility News, Feature Stories and Releases Highlights from DOE Scientific User Facility at AGU Fall Meeting 2009 Scientists from around the world use data from the U.S....
Minimizing Binding Errors Using Learned Conjunctive Features
We have studied some of the design trade-offs governing visual representations based on spatially invariant conjunctive feature detectors, with an emphasis on the susceptibility of such systems to false-positive recognition errors�Malsburg's classical ...
Bartlett W. Mel; J�zsef W. Fiser
We have studied some of the design trade-offs governing visual representations based on spatially invariant conjunctive feature detectors, with an emphasis on the susceptibility of such systems to false-positive recognition errors�Malsburg�s ...
Bartlett W. Mel; J�sef W. Fiser
Feature extraction for structural dynamics model validation
This study focuses on defining and comparing response features that can be used for structural dynamics model validation studies. Features extracted from dynamic responses obtained analytically or experimentally, such as basic signal statistics, frequency spectra, and estimated time-series models, can be used to compare characteristics of structural system dynamics. By comparing those response features extracted from experimental data and numerical outputs, validation and uncertainty quantification of numerical model containing uncertain parameters can be realized. In this study, the applicability of some response features to model validation is first discussed using measured data from a simple test-bed structure and the associated numerical simulations of these experiments. issues that must be considered were sensitivity, dimensionality, type of response, and presence or absence of measurement noise in the response. Furthermore, we illustrate a comparison method of multivariate feature vectors for statistical model validation. Results show that the outlier detection technique using the Mahalanobis distance metric can be used as an effective and quantifiable technique for selecting appropriate model parameters. However, in this process, one must not only consider the sensitivity of the features being used, but also correlation of the parameters being compared.
Hemez, Francois [Los Alamos National Laboratory; Farrar, Charles [Los Alamos National Laboratory; Park, Gyuhae [Los Alamos National Laboratory; Nishio, Mayuko [UNIV OF TOKYO; Worden, Keith [UNIV OF SHEFFIELD; Takeda, Nobuo [UNIV OF TOKYO
Topology-based Feature Definition and Analysis
Defining high-level features, detecting them, tracking them and deriving quantities based on them is an integral aspect of modern data analysis and visualization. In combustion simulations, for example, burning regions, which are characterized by high fuel-consumption, are a possible feature of interest. Detecting these regions makes it possible to derive statistics about their size and track them over time. However, features of interest in scientific simulations are extremely varied, making it challenging to develop cross-domain feature definitions. Topology-based techniques offer an extremely flexible means for general feature definitions and have proven useful in a variety of scientific domains. This paper will provide a brief introduction into topological structures like the contour tree and Morse-Smale complex and show how to apply them to define features in different science domains such as combustion. The overall goal is to provide an overview of these powerful techniques and start a discussion how these techniques can aid in the analysis of astrophysical simulations.
Weber, Gunther H.; Bremer, Peer-Timo; Gyulassy, Attila; Pascucci, Valerio
The 2011 February 15 X2.2 flare and associated Earth-directed halo coronal mass ejection were observed in unprecedented detail with high resolution in spatial, temporal, and thermal dimensions by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory, as well as by instruments on the two STEREO spacecraft, then at near-quadrature relative to the Sun-Earth line. These observations enable us to see expanding loops from a flux-rope-like structure over the shearing polarity-inversion line between the central {delta}-spot groups of AR 11158, developing a propagating coronal front ('EIT wave'), and eventually forming the coronal mass ejection moving into the inner heliosphere. The observations support the interpretation that all of these features, including the 'EIT wave', are signatures of an expanding volume traced by loops (much larger than the flux rope only), surrounded by a moving front rather than predominantly wave-like perturbations; this interpretation is supported by previously published MHD models for active-region and global scales. The lateral expansion of the eruption is limited to the local helmet-streamer structure and halts at the edges of a large-scale domain of connectivity (in the process exciting loop oscillations at the edge of the southern polar coronal hole). The AIA observations reveal that plasma warming occurs within the expansion front as it propagates over quiet Sun areas. This warming causes dimming in the 171 A (Fe IX and Fe X) channel and brightening in the 193 and 211 A (Fe XII-XIV) channels along the entire front, while there is weak 131 A (Fe VIII and Fe XXI) emission in some directions. An analysis of the AIA response functions shows that sections of the front running over the quiet Sun are consistent with adiabatic warming; other sections may require additional heating which MHD modeling suggests could be caused by Joule dissipation. Although for the events studied here the effects of volumetric expansion are much more obvious than true wave phenomena, we discuss how different magnetic environments within and around the erupting region can lead to the signatures of either or both of these aspects.
Schrijver, Carolus J.; Title, Alan M. [Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Aulanier, Guillaume; Pariat, Etienne; Delannee, Cecile, E-mail: firstname.lastname@example.com, E-mail: firstname.lastname@example.com, E-mail: email@example.com, E-mail: email@example.com, E-mail: email@example.com [LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, 92190 Meudon (France)
Low temperature front surface passivation of interdigitated back contact silicon heterojunction solar cell
The interdigitated back contact silicon heterojunction (IBC-SHJ) solar cell requires a low temperature front surface passivation/anti-reflection structure. Conventional silicon surface passivation using SiO2 or a-SiNx is performed at temperature higher than 400�C, which is not suitable for the IBC-SHJ cell. In this paper, we propose a PECVD a-Si:H/a-SiNx:H/a-SiC:H stack structure to passivate the front surface of crystalline silicon at low temperature. The optical properties and passivation quality of this structure are characterized and solar cells using this structure are fabricated. With 2 nm a-Si:H layer, the stack structure exhibits stable passivation with effective minority carrier lifetime higher than 2 ms, and compatible with IBC-SHJ solar cell processing. A critical advantage of this structure is that the SiC allows it to be HF resistant, thus it can be deposited as the first step in the process. This protects the a-Si/c-Si interface and maintains a low surface recombination velocity.
Shu, Brent; Das, Ujjwal; Jani, Omkar; Hegedus, Steve; Birkmire, Robert
Statistical nature of cold fronts within the Gulf of Mexico and their potential influence on OTEC operations
This study was undertaken to quantify selected aspects of cold fronts as they penetrate southward into the Gulf of Mexico region. A need arises to statistically define the nature of these cold fronts since the Department of Energy's Ocean Thermal Energy Conversion (OTEC) program is geared for determining the feasibility of utilizing the temperature difference between the tropical ocean surface and depths of approximately 1500 m for the production of power. However, severe winters are known to significantly decrease the normal sea surface temperature by approximately 7.2/sup 0/F as well as cause deepening of the mixed layer (Leetmaa, 1977). With an OTEC plant operating at efficiencies of only 2 to 3 percent, the plant could become marginally operational during the winter months. Upon the passage of a cold front, the sea surface will exchange heat to the atmosphere through the fluxes of latent and sensible heat. Garstang (1969) has shown that these fluxes can increase more than an order of magnitude upon the passage of a moderate cold front. Long term, greater than 25 years, meteorological data from the National Climatic Center was used as the basis for determining the impact of cold fronts in the gulf of Mexico region. In particular, surface air temperature and wind direction were analyzed daily during the months of December, January, and February. The drop in temperature as well as the directional wind shift were the criteria for the frontal passage. Surface observation data from Tampa and Key West, Florida were used.
Ulanski, S.L.
Satellite stories featured in Lab lecture series
February » February » Satellite stories featured Satellite stories featured in Lab lecture series Space adventures will be featured in the upcoming Frontiers in Science lecture series "Small Satellites on a Shoestring: The LANL Experience." February 14, 2008 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.
Munitions related feature extraction from LIDAR data.
The characterization of former military munitions ranges is critical in the identification of areas likely to contain residual unexploded ordnance (UXO). Although these ranges are large, often covering tens-of-thousands of acres, the actual target areas represent only a small fraction of the sites. The challenge is that many of these sites do not have records indicating locations of former target areas. The identification of target areas is critical in the characterization and remediation of these sites. The Strategic Environmental Research and Development Program (SERDP) and Environmental Security Technology Certification Program (ESTCP) of the DoD have been developing and implementing techniques for the efficient characterization of large munitions ranges. As part of this process, high-resolution LIDAR terrain data sets have been collected over several former ranges. These data sets have been shown to contain information relating to former munitions usage at these ranges, specifically terrain cratering due to high-explosives detonations. The location and relative intensity of crater features can provide information critical in reconstructing the usage history of a range, and indicate areas most likely to contain UXO. We have developed an automated procedure using an adaptation of the Circular Hough Transform for the identification of crater features in LIDAR terrain data. The Circular Hough Transform is highly adept at finding circular features (craters) in noisy terrain data sets. This technique has the ability to find features of a specific radius providing a means of filtering features based on expected scale and providing additional spatial characterization of the identified feature. This method of automated crater identification has been applied to several former munitions ranges with positive results.
Roberts, Barry L.
Improving the Detection of Wind Features In Backscatter LIDAR Scans Using Feature Extraction.
??This thesis presents the results of applying image segmentation techniques to incoherent LIDAR data to improve the detection of wind features. Improving the detection and� (more)
Rotthoff, Eric
Visualization of research fronts and knowledge bases by three-dimensional areal densities of bibliographically coupled publications and co-citations
In this work the well known scientometric concepts of bibliographically coupled publications and co-cited references were applied to produce interactive maps of research fronts and knowledge bases of research fields. This article proposes a method and ... Keywords: 3D-visualisation, Battery research, Bibliographic coupling, Co-citation analysis, Emerging research fronts, Jaccard index, Knowledge bases, Local paper density, Research fronts, Science mapping, Similarity, Spatial density
Edgar Schiebel
ANL/APS/TB-5 Functional Description of APS Beamline Front Ends
Functional Description of APS Beamline Front Ends by Tuncer Kuzay February 1993 Advanced Photon Source & Argonne National Laboratory, Argonne, Illinois 60439 o operated by The University of Chicago for the United States Department of Energy under Contract W-31-1 09-Eng-38 Argonne National Laboratory, with facilties in the states of Ilinois and Idaho, is owned by the United States government, and operated by The University of Chicago under the provisions of a contract with the Deparment of Energy. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any waranty, express or implied, or assumes any legal liability or responsibility for the accuracy,
Dynamic stabilization of Rayleigh-Taylor instability in an ablation front
Dynamic stabilization of Rayleigh-Taylor instability in an ablation front is studied by considering a modulation in the acceleration that consists of sequences of Dirac deltas. This allows obtaining explicit analytical expressions for the instability growth rate as well as for the boundaries of the stability region. As a general rule, it is found that it is possible to stabilize all wave numbers above a certain minimum value k{sub m}, but the requirements in the modulation amplitude and frequency become more exigent with smaller k{sub m}. The essential role of compressibility is phenomenologically addressed in order to find the constraint it imposes on the stability region. The results for some different wave forms of the acceleration modulation are also presented.
Piriz, A. R.; Di Lucchio, L.; Rodriguez Prieto, G. [ETSI Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real (Spain) and Instituto de Investigaciones Energeticas, 13071 Ciudad Real (Spain)
On the ``massless gap`` adjustment of detected energy for passive material in front of a calorimeter
I have designed a correction scheme for energy losses in passive material in front of a calorimeter based on the ``massless gap`` idea. I use a flexible geometry model of a calorimeter design for SDC outside of a solenoidal coil made of aluminium cylinders of adjustable thickness. The signal from the first radiation length of active calorimetry is scaled dependent on the incoming and observed energies of the shower. A reasonable recovery of the resolution of an unobstructed calorimeter is achieved using correction factors that depend only upon the total thickness of passive material. Thus a useful correction may be built into the hardware by increasing the amount of scintillator in the first radiation length of the active calorimeter. The distribution of correction factors determined event-by-event indicate that an additional dependence on the observed signal in the massless gap and total incident energy is clearly present.
Trost, H.J.
On the massless gap'' adjustment of detected energy for passive material in front of a calorimeter
I have designed a correction scheme for energy losses in passive material in front of a calorimeter based on the massless gap'' idea. I use a flexible geometry model of a calorimeter design for SDC outside of a solenoidal coil made of aluminium cylinders of adjustable thickness. The signal from the first radiation length of active calorimetry is scaled dependent on the incoming and observed energies of the shower. A reasonable recovery of the resolution of an unobstructed calorimeter is achieved using correction factors that depend only upon the total thickness of passive material. Thus a useful correction may be built into the hardware by increasing the amount of scintillator in the first radiation length of the active calorimeter. The distribution of correction factors determined event-by-event indicate that an additional dependence on the observed signal in the massless gap and total incident energy is clearly present.
Control of Beam Losses in the Front End for the Neutrino Factory
In the Neutrino Factory and Muon Collider, muons are produced by firing high energy protons onto a target to produce pions. The pions decay to muons which are then accelerated. This method of pion production results in significant background from protons and electrons, which may result in heat deposition on superconducting materials and activation of the machine preventing manual handling. In this paper we discuss the design of a secondary particle handling system. The system comprises a solenoidal chicane that filters high momentum particles, followed by a proton absorber that reduces the energy of all particles, resulting in the rejection of low energy protons that pass through the solenoid chicane. We detail the design and optimization of the system and its integration with the rest of the muon front end.
Neuffer, D.V.; /Fermilab; Snopok, P.; /IIT, Chicago; Rogers, C.T.; /Rutherford
Prototype ATLAS IBL Modules using the FE-I4A Front-End Readout Chip
The ATLAS Collaboration will upgrade its semiconductor pixel tracking detector with a new Insertable B-layer (IBL) between the existing pixel detector and the vacuum pipe of the Large Hadron Collider. The extreme operating conditions at this location have necessitated the development of new radiation hard pixel sensor technologies and a new front-end readout chip, called the FE-I4. Planar pixel sensors and 3D pixel sensors have been investigated to equip this new pixel layer, and prototype modules using the FE-I4A have been fabricated and characterized using 120 GeV pions at the CERN SPS and 4 GeV positrons at DESY, before and after module irradiation. Beam test results are presented, including charge collection efficiency, tracking efficiency and charge sharing.
Albert, J; Alimonti, Gianluca; Allport, Phil; Altenheiner, Silke; Ancu, Lucian; Andreazza, Attilio; Arguin, Jean-Francois; Arutinov, David; Backhaus, Malte; Bagolini, Alvise; Ballansat, Jacques; Barbero, Marlon; Barbier, G�rard; Bates, Richard; Battistin, Michele; Baudin, Patrick; Beau, Tristan; Beccherle, Roberto; Beck, Hans Peter; Benoit, Mathieu; Bensinger, Jim; Bomben, Marco; Borri, Marcello; Boscardin, Maurizio; Botelho Direito, Jose Antonio; Bousson, Nicolas; Boyd, George Russell Jr; Breugnon, Patrick; Bruni, Graziano; Bruschi, Marco; Buchholz, Peter; Buttar, Craig; Cadoux, Franck; Calderini, Giovanni; Caminada, Leah; Capeans, Mar; Casse, Gianluigi; Catinaccio, Andrea; Cavalli-Sforza, Matteo; Chauveau, Jacques; Chu, Ming-Lee; Ciapetti, Marco; Cindro, Vladimir; Citterio, Mauro; Clark, Allan; Cobal, Marina; Coelli, Simone; Colijn, Auke-Pieter; Colin, Daly; Collot, Johann; Crespo-Lopez, Olivier; Dalla Betta, Gian-Franco; Darbo, Giovanni; DaVia, Cinzia; David, Pierre-Yves; Debieux, St�phane; Delebecque, Pierre; Devetak, Erik; DeWilde, Burton; Di Girolamo, Beniamino; Dinu, Nicoleta; Dittus, Fridolin; Diyakov, Denis; Djama, Fares; Dobos, Daniel Adam; Doonan, Kate; Dopke, Jens; Dorholt, Ole; Dube, Sourabh; Dushkin, Andrey; Dzahini, Daniel; Egorov, Kirill; Ehrmann, Oswin; Elldge, David; Elles, Sabine; Elsing, Markus; Eraud, Ludovic; Ereditato, Antonio; Eyring, Andreas; Falchieri, Davide; Falou, Aboud; Fang, Xiaochao; Fausten, Camille; Favre, Yannick; Ferrere, Didier; Fleta, Celeste; Fleury, Julien; Flick, Tobias; Forshaw, Dean; Fougeron, Denis; Fritzsch, Thomas; Gabrielli, Alessandro; Gaglione, Renaud; Gallrapp, Christian; Gan, K; Garcia-Sciveres, Maurice; Gariano, Giuseppe; Gastaldi, Thibaut; Gemme, Claudia; Gensolen, Fabrice; George, Matthias; Ghislain, Patrick; Giacomini, Gabriele; Gibson, Stephen; Giordani, Mario Paolo; Giugni, Danilo; Gjersdal, H�vard; Glitza, Karl Walter; Gnani, Dario; Godlewski, Jan; Gonella, Laura; Gorelov, Igor; Gori�ek, Andrej; G�ssling, Claus; Grancagnolo, Sergio; Gray, Heather; Gregor, Ingrid-Maria; Grenier, Philippe; Grinstein, Sebastian; Gromov, Vladimir; Grondin, Denis; Grosse-Knetter, J�rn; Hansen, Thor-Erik; Hansson, Per; Harb, Ali; Hartman, Neal; Hasi, Jasmine; Hegner, Franziska; Heim, Timon; Heinemann, Beate; Hemperek, Tomasz; Hessey, Nigel; Hetm�nek, Martin; Hoeferkamp, Martin; Hostachy, Jean-Yves; H�gging, Fabian; Husi, Coralie; Iacobucci, Giuseppe; Idarraga, John; Ikegami, Yoichi; Jano�ka, Zdenko; Jansen, Jens; Jansen, Luc; Jensen, Frank; Jentzsch, Jennifer; Joseph, John; Kagan, Harris; Karagounis, Michael; Kass, Richard; Kenney, Christopher J; Kersten, Susanne; Kind, Peter; Klingenberg, Reiner; Kluit, Ruud; Kocian, Martin; Koffeman, Els; Kok, Angela; Korchak, Oleksandr; Korolkov, Ilya; Kostyukhin, Vadim; Krieger, Nina; Kr�ger, Hans; Kruth, Andre; Kugel, Andreas; Kuykendall, William; La Rosa, Alessandro; Lai, Chung-Hang; Lantzsch, Kerstin; Laporte, Didier; Lapsien, Tobias; Lounis, abdenour; Lozano, Manuel; Lu, Yunpeng; Lubatti, Henry; Macchiolo, Anna; Mallik, Usha; Mandi?, Igor; Marchand, Denis; Marchiori, Giovanni; Massol, Nicolas; Matthias, Wittgen; M�ttig, Peter; Mekkaoui, Abderrazak; Menouni, Mohsine; Menu, Johann; Meroni, Chiara; Mesa, Javier; Micelli, Andrea; Michal, S�bastien; Miglioranzi, Silvia; Miku�, Marko; Mitsui, Shingo; Monti, Mauro; Moore, J; Morettini, Paolo; Muenstermann, Daniel; Murray, Peyton; Nellist, Clara; Nelson, David J; Nessi, Marzio; Neumann, Manuel; Nisius, Richard; Nordberg, Markus; Nuiry, Francois-Xavier; Oppermann, Hermann; Oriunno, Marco; Padilla, Cristobal; Parker, Sherwood; Pellegrini, Giulio; Pelleriti, Gabriel; Pernegger, Heinz; Piacquadio, Nicola Giacinto; Picazio, Attilio; Pohl, David; Polini, Alessandro; Popule, Ji?�; Portell Bueso, Xavier; Povoli, Marco; Puldon, David; Pylypchenko, Yuriy; Quadt, Arnulf; Quirion, David; Ragusa, Francesco; Rambure, Thibaut; Richards, Erik; Ristic, Branislav; R�hne, Ole; Rothermund, Mario; Rovani, Alessandro; Rozanov, Alexandre; Rubinskiy, Igor; Rudolph, Matthew Scott; Rummler, Andr�; Ruscino, Ettore; Salek, David; Salzburger, Andreas; Sandaker, Heidi; Schipper, Jan-David; Schneider, Basil; Schorlemmer, Andre; Schroer, Nicolai; Schwemling, Philippe; Seidel, Sally; Seiden, Abraham; ��cho, Petr; Skubic, Patrick; Sloboda, Michal; Smith, D; Sood, Alex; Spencer, Edwin; Strang, Michael; Stugu, Bjarne; Stupak, John; Su, Dong; Takubo, Yosuke; Tassan, Jean; Teng, Ping-Kun; Terada, Susumu; Todorov, Theodore; Tom�ek, Michal; Toms, Konstantin; Travaglini, Riccardo; Trischuk, William; Troncon, Clara; Troska, Georg
The first photon shutter development for APS insertion device beamline front ends
One of the most critical components on the Advanced Photon Source (APS) insertion device (ID) beamline front ends is the first photon shutter. It operates in two modes to fully intercept the high total power and high-heat flux ID photon beam in seconds (normal mode) or in less than 100 ms (emergency fast mode). It is designed to operate in ultra high vacuum (UHV). The design incorporates a multi-channel rectangular bar, bent in a ``hockey stick`` configuration, with two-point suspension. The flanged end is an articulated bellows with rolling hinges. The actuation end is a spring-assisted, pneumatic fail-safe flexural pivot type. The coolant (water) channels incorporate brazed copper foam to enhance the heat transfer, a tube technology particular to the APS. The design development, and material aspects, as well as the extensive thermal and vibrational analyses in support of the design, are presented in this paper.
Shu, Deming; Nian, H.L.T.; Wang, Zhibi; Collins, J.T.; Ryding, D.G.; Kuzay, T.M.
One of the most critical components on the Advanced Photon Source (APS) insertion device (ID) beamline front ends is the first photon shutter. It operates in two modes to fully intercept the high total power and high-heat flux ID photon beam in seconds (normal mode) or in less than 100 ms (emergency fast mode). It is designed to operate in ultra high vacuum (UHV). The design incorporates a multi-channel rectangular bar, bent in a hockey stick'' configuration, with two-point suspension. The flanged end is an articulated bellows with rolling hinges. The actuation end is a spring-assisted, pneumatic fail-safe flexural pivot type. The coolant (water) channels incorporate brazed copper foam to enhance the heat transfer, a tube technology particular to the APS. The design development, and material aspects, as well as the extensive thermal and vibrational analyses in support of the design, are presented in this paper.
$|V_{ub}|$ and $B\\to\\eta^{(')}$ Form Factors in Covariant Light Front Approach
We study $B\\to (\\pi, \\eta, \\eta')$ transition form factors in the framework of covariant light front approach. With the theoretical uncertainties, we find that $B\\to (\\pi, \\eta, \\eta')$ form factors at $q^2=0$ are $f^{(\\pi, \\eta, \\eta')}_{+}(0)=(0.245^{+0.000}_{-0.001}\\pm 0.011, 0.220 \\pm 0.009\\pm0.009, 0.180\\pm 0.008^{+0.008}_{-0.007})$ for vector current and $f^{(\\pi, \\eta, \\eta')}_{T}(0)=(0.239^{+0.002+0.020}_{-0.003-0.018}, 0.211\\pm 0.009^{+0.017}_{-0.015}, 0.173\\pm 0.007^{+0.014}_{-0.013})$ for tensor current, respectively. With the obtained $q^2$-dependent $f^{\\pi}_{+}(q^2)$ and observed branching ratio (BR) for $\\bar B_d\\to \\pi^+ \\ell \\bar \
Chen, Chuan-Hung; Wang, Wei
Scintillation counter and wire chamber front end modules for high energy physics experiments
This document describes two front-end modules developed for the proposed MIPP upgrade (P-960) experiment at Fermilab. The scintillation counter module was developed for the Plastic Ball detector time and charge measurements. The module has eight LEMO 00 input connectors terminated with 50 ohms and accepts negative photomultiplier signals in the range 0.25...1000 pC with the maximum input voltage of 4.0 V. Each input has a passive splitter with integration and differentiation times of {approx}20 ns. The integrated portion of the signal is digitized at 26.55 MHz by Analog Devices AD9229 12-bit pipelined 4-channel ADC. The differentiated signal is discriminated for time measurement and sent to one of the four TMC304 inputs. The 4-channel TMC304 chip allows high precision time measurement of rising and falling edges with {approx}100 ps resolution and has internal digital pipeline. The ADC data is also pipelined which allows deadtime-less operation with trigger decision times of {approx}4 {micro}s. The wire chamber module was developed for MIPP EMCal detector charge measurements. The 32-channel digitizer accepts differential analog signals from four 8-channel integrating wire amplifiers. The connection between wire amplifier and digitizer is provided via 26-wire twist-n-flat cable. The wire amplifier integrates input wire current and has sensitivity of 275 mV/pC and the noise level of {approx}0.013 pC. The digitizer uses the same 12-bit AD9229 ADC chip as the scintillator counter module. The wire amplifier has a built-in test pulser with a mask register to provide testing of the individual channels. Both modules are implemented as a 6Ux220 mm VME size board with 48-pin power connector. A custom europack (VME) 21-slot crate is developed for housing these front-end modules.
Baldin, Boris; DalMonte, Lou; /Fermilab
Chandra Observation of MS 1455.0+2232: cold fronts in a massive cooling flow cluster?
We present the Chandra observation of the cluster of galaxies MS 1455.0+2232. From previous ASCA and ROSAT observations, this cluster was identified as a ``relaxed'' cluster that hosts one of the most massive cooling flows detected. With higher angular resolution, the Chandra X-ray image shows the presence of two surface brightness edges on opposite sides of the X-ray peak: the first at 190 kpc to the north and the second at 450 kpc to the south. Even though the low exposure of this observation limits our ability to constrain the temperature jump across both edges, we show that the northern edge is likely to be a ``cold front'' similar to others observed recently by Chandra in the clusters A2142, A3667, RX J1720.1+2638, and A2256. The observed cold front is most likely produced by the motion, from south to north, of a group-size dark matter halo. The most natural explanation for the presence of this observed moving subclump is that MS 1455.0+2232 is a merger cluster in the very last stage before it becomes fully relaxed. This scenario, however, appears to be unlikely as the cluster shows no further sign of ongoing merger. Moreover, it is not clear if a massive cooling flow could have survived this kind of merger. We propose an alternative scenario in which, as for RX J1720.1+2638, MS 1455.0+2232 is the result of the hierarchical collapse of two co-located density perturbations, the first a group-scale perturbation collapse followed by a second cluster-scale perturbation collapse that surrounded, but did not destroy, the first. We suggest that a cooling flow may have begun inside the already collapsed group-scale perturbation and may have been later amplified by the gas compression induced by the infall of the overlying main cluster mass.
P. Mazzotta; M. Markevitch; W. R. Forman; C. Jones; A. Vikhlinin; L. VanSpeybroeck
Development/Demonstration of an Advanced Oxy-Fuel Front-End System
Owens Corning and other glass manufacturers have used oxy-fuel combustion technology successfully in furnaces to reduce emissions, increase throughput, reduce fuel consumption and, depending on the costs of oxygen and fuel, reduce energy costs. The front end of a fiberglass furnace is the refractory channel system that delivers glass from the melter to the forming process. After the melter, it is the second largest user of energy in a fiberglass plant. A consortium of glass companies and suppliers, led by Owens Corning, was formed to develop and demonstrate oxy/fuel combustion technology for the front end of a fiberglass melter, to demonstrate the viability of this energy saving technology to the U.S. glass industry, as a D.O.E. sponsored project. The project goals were to reduce natural gas consumption and CO2 green house gas emissions by 65 to 70% and create net cost savings after the purchase of oxygen to achieve a project payback of less than 2 years. Project results in Jackson, TN included achieving a 56% reduction in gas consumption and CO2 emissions. A subsequent installation in Guelph ON, not impacted by unrelated operational changes in Jackson, achieved a 64% reduction. Using the more accurate 64% reduction in the payback calculation yielded a 2.2 year payback in Jackson. The installation of the demonstration combustion system saves 77,000 DT/yr of natural gas or 77 trillion Btu/yr and eliminates 4500 tons/yr of CO2 emissions. This combustion system is one of several energy and green house gas reduction technologies being adopted by Owens Corning to achieve aggressive goals relating to the company�s global facility environmental footprint.
Mighton, Steven, J.
A Cold Frontal Rainband Observed during the LANDES-FRONTS 84 Experiment: Mesoscale and Small-Scale Structure Inferred from Dual-Doppler Radar Analysis.
This paper presents the kinematic structure of a cold frontal rainband associated with a secondary cold front which moved over southwest of France on 4 June 1984.
Y. Lemaitre; G. Scialom; P. Amayenc
The rate of oxidation is important to the long-term performance of reducing salt waste forms because the solubility of some contaminants, e.g., technetium, is a function of oxidation state. TcO{sub 4}{sup ?} in the salt solution is reduced to Tc(IV) and has been shown to react with ingredients in the waste form to precipitate low solubility sulfide and/or oxide phases. Upon exposure to oxygen, the compounds containing Tc(IV) oxidize to the pertechnetate ion, Tc(VII)O{sub 4}{sup ?}, which is very soluble. Consequently the rate of technetium oxidation front advancement into a monolith and the technetium leaching profile as a function of depth from an exposed surface are important to waste form performance and ground water concentration predictions. An approach for measuring contaminant oxidation rate (effective contaminant specific oxidation rate) based on leaching of select contaminants of concern is described in this report. In addition, the relationship between reduction capacity and contaminant oxidation is addressed. Chromate (Cr(VI) was used as a non-radioactive surrogate for pertechnetate, Tc(VII), in Cast Stone samples prepared with 5 M Simulant. Cast Stone spiked with pertechnetate was also prepared and tested. Depth discrete subsamples spiked with Cr were cut from Cast Stone exposed to Savannah River Site (SRS) outdoor ambient temperature fluctuations and moist air. Depth discrete subsamples spiked with Tc-99 were cut from Cast Stone exposed to laboratory ambient temperature fluctuations and moist air. Similar conditions are expected to be encountered in the Cast Stone curing container. The leachability of Cr and Tc-99 and the reduction capacities, measured by the Angus-Glasser method, were determined for each subsample as a function of depth from the exposed surface. The results obtained to date were focused on continued method development and are preliminary and apply to the sample composition and curing / exposure conditions described in this report. � The Cr oxidation front (depth to which soluble Cr was detected) for the Cast Stone sample exposed for 68 days to ambient outdoor temperatures and humid air (total age of sample was 131 days) was determined to be about 35 mm below the top sample surface exposed. The Tc oxidation front, depth at which Tc was insoluble, was not determined. Interpretation of the results indicates that the oxidation front is at least 38 mm below the exposed surface. The sample used for this measurement was exposed to ambient laboratory conditions and humid air for 50 days. The total age of the sample was 98 days. � Technetium appears to be more easily oxidized than Cr in the Cast Stone matrix. The oxidized forms of Tc and Cr are soluble and therefore leachable. Longer exposure times are required for both the Cr and Tc spiked samples to better interpret the rate of oxidation. Tc spiked subsamples need to be taken further from the exposed surface to better define and interpret the leachable Tc profile. � Finally Tc(VII) reduction to Tc(IV) appears to occur relatively fast. Results demonstrated that about 95 percent of the Tc(VII) was reduced to Tc(IV) during the setting and very early stage setting for a Cast Stone sample cured 10 days. Additional testing at longer curing times is required to determine whether additional time is required to reduce 100 % of the Tc(VII) in Cast Stone or whether the Tc loading exceeded the ability of the waste form to reduce 100 % of the Tc(VII). Additional testing is required for samples cured for longer times. Depth discrete subsampling in a nitrogen glove box is also required to determine whether the 5 percent Tc extracted from the subsamples was the result of the sampling process which took place in air. Reduction capacity measurements (per the Angus-Glasser method) performed on depth discrete samples could not be correlated with the amount of chromium or technetium leached from the depth discrete subsamples or with the oxidation front inferred from soluble chromium and technetium (i.e., effective Cr and Tc oxidation fronts). Residual reduct
Langton, C.
An orthogonal access modifier model for feature-oriented programming
In feature-oriented programming (FOP), a programmer decomposes a program in terms of features. Ideally, features are implemented modularly so that they can be developed in isolation. Access control is an important ingredient to attain feature ... Keywords: feature-oriented programming, orthogonal access modifier model
Sven Apel; J�rg Liebig; Christian K�stner; Martin Kuhlemann; Thomas Leich
Toward Automated Identification of Sea Surface Temperature Front Signatures in Radarsat-2 Images
The Canadian Forces Meteorology and Oceanography Center produces a near-daily ocean feature analysis, based on sea surface temperature (SST) images collected by spaceborne radiometers, to keep the fleet informed of the location of tactically ...
Chris T. Jones; Todd D. Sikora; Paris W. Vachon; John Wolfe
December 30, 2013 [Feature Stories and Releases] December 30, 2013 [Feature Stories and Releases] Pole Position: New Field Campaigns Explore Arctic and Antarctic Atmosphere Bookmark and Share Each year, the ARM Climate Research Facility receives proposals to use key components of the Facility for extended or intensive field campaigns to improve understanding of atmospheric processes that are relevant to regional and global climate. The Department of Energy has selected the following field campaigns that take place from 2014 through 2016. ARM West Antarctic Radiation Experiment (AWARE) McMurdo Station is a scientific outpost located on the southern tip of Ross Island, Antarctica. McMurdo Station is a scientific outpost located on the southern tip of Ross Island, Antarctica. West Antarctic is an area nearly devoid of atmospheric and climate
August 13, 2012 [Feature Stories and Releases] August 13, 2012 [Feature Stories and Releases] Up Close and Personal at Cape Cod National Seashore Bookmark and Share Visitors make their way to the ARM Mobile Facility, located on a coastal bluff near the Highlands Center at Cape Cod National Seashore. Visitors make their way to the ARM Mobile Facility, located on a coastal bluff near the Highlands Center at Cape Cod National Seashore. Enjoying fair skies and ocean breezes, a large and enthusiastic crowd gathered at the Highlands Center at Cape Cod National Seashore in late July to officially kick off the year-long Two-Column Aerosol Project, or TCAP. About 50 area stakeholders, four staff from the Massachusetts federal and state Congressional delegations, and several DOE officials joined project partners from the ARM Facility and National Park Service (NPS) who
May 13, 2009 [Feature Stories and Releases] May 13, 2009 [Feature Stories and Releases] Preparations Heat Up for Field Campaign in Chile Bookmark and Share Test period simulates daily operations for remote deployment in Atacama Desert Science and operations team members observe data transmitted from the weather balloon launched during training for RHUBC-II. Science and operations team members observe data transmitted from the weather balloon launched during training for RHUBC-II. At an elevation of more than 5000 meters on the Atacama Desert in Chile, the site for the second phase of the upcoming Radiative Heating in Underexplored Bands Campaign is not only very high, but also remote. To reduce the potential for surprises, the science and operations team completed a comprehensive beta test at the Pagosa Springs Staging Facility
September 28, 2011 [Facility News, Feature Stories and Releases, September 28, 2011 [Facility News, Feature Stories and Releases, Publications] Pass the lotion; new study shows drying trend over Great Plains Bookmark and Share Analysis of infrared energy levels useful for similar evaluations at local scale Illustration of seasonal infrared energy trends observed at the ARM Southern Great Plains site between 1996 and 2010. Click on image to enlarge. Illustration of seasonal infrared energy trends observed at the ARM Southern Great Plains site between 1996 and 2010. Click on image to enlarge. In a study published this month in the Journal of Climate, researchers found less infrared energy reaching Earth's surface above the Great Plains region of the United States. This decrease in infrared energy is due to a decrease in the amount of water vapor and fewer clouds over this
8, 2009 [Facility News, Feature Stories and Releases] 8, 2009 [Facility News, Feature Stories and Releases] Thumbs-Up for Radar Design Reviews-Key Recovery Act Milestone Bookmark and Share Of the $60 million allocated to the ARM Climate Research Facility by the American Recovery and Reinvestment Act, nearly half that amount is designated for 18 new scanning radars as well as upgrades to the baseline ARM millimeter wave cloud radars (MMCR) located throughout the Facility. In November, ARM engineering staff led a series of preliminary design reviews with the radar vendors to discuss progress thus far. All participants agreed to move forward with the plans and detailed designs presented, marking the completion of a key milestone in achieving the Recovery Act deployment schedule. Kevin Widener Kevin Widener "This review gives us the first look of what the radar physically looks
23, 2008 [Feature Stories and Releases] 23, 2008 [Feature Stories and Releases] Field Campaigns for 2010 Range from the Arctic to the Azores Bookmark and Share With the recent awards, the ARM Mobile Facility deployment on Graciosa Island in the Azores is extended from its original 9-month duration, beginning in May 2009 and now lasting through November 2010. With the recent awards, the ARM Mobile Facility deployment on Graciosa Island in the Azores is extended from its original 9-month duration, beginning in May 2009 and now lasting through November 2010. The Department of Energy recently announced the selection of major ARM field campaigns that will take place in 2010. Studies led by principal investigators Rob Wood, Hans Verlinde, and Jay Mace will examine marine, mixed-phase, and cirrus clouds in the Azores, Alaska, the Great Plains, and
February 26, 2007 [Feature Stories and Releases] February 26, 2007 [Feature Stories and Releases] Arctic Winter Provides Window of Opportunity to Improve Climate Models Bookmark and Share Dry winter conditions allows scientists to explore elusive portions of the electromagnetic spectrum Contact: Lynne Roeder, 509.372.4331 In conjunction with other scientific activities taking place during International Polar Year 2007-2008, today an international research team begins a three-week field campaign in Barrow, Alaska. The experiment, which is sponsored by the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) Climate Research Facility, uses a new suite of sophisticated instruments to provide the first simultaneous high-resolution dataset of Arctic clear sky and cirrus cloud properties in the
December 9, 2010 [Feature Stories and Releases] December 9, 2010 [Feature Stories and Releases] Scientists Begin 5-month Study of Cloud Life Cycles Bookmark and Share Instruments at four mountain sites gather data to improve climate models. For Immediate Release: Thursday, December 9, 2010 Just outside Thunderhead Lodge in the Steamboat Springs ski area, one of the ARM Mobile Facility sites hosts a scanning cloud radar and several other instruments. Just outside Thunderhead Lodge in the Steamboat Springs ski area, one of the ARM Mobile Facility sites hosts a scanning cloud radar and several other instruments. Steamboat Springs, Colorado - Ski season is snow season, and snow season means clouds-exactly what a team of atmospheric scientists in "Ski Town USA" are anticipating. For the next five months, a dense collection of
8, 2005 [Feature Stories and Releases] 8, 2005 [Feature Stories and Releases] International Climate Researchers Meet in U.S. to Simulate Flight Operations for Tropical Storm Cloud Experiment Bookmark and Share Press Release Media Contact: Lynne Roeder, 509.372.4331 Technical Contact: Mike Janes, 925.294.2447 The Southern Surveyor research vessel will be equipped with a full compliment of surface-based instrumentation for measuring atmospheric and oceanographic properties. The ship will also serve as one of the locations for launching radiosondes (weather balloons), as well as a surface site for measuring energy fluxes. The Southern Surveyor research vessel will be equipped with a full compliment of surface-based instrumentation for measuring atmospheric and oceanographic properties. The ship will also serve as one of the locations
May 19, 2008 [Feature Stories and Releases] May 19, 2008 [Feature Stories and Releases] A Quest for Answers About Aerosols Bookmark and Share Data will enhance understanding of regional effects and global transport of aerosols Contact: Lynne Roeder, ARM Public Information Officer, 509.372.4331 The Pacific Rim includes countries and cities located around the edge of the Pacific Ocean. The Pacific Rim includes countries and cities located around the edge of the Pacific Ocean. Aerosols are tiny airborne particles, such as dust from farming and soot from industrial plants. Aerosols in China are very dense and have diverse properties which have been observed in the atmosphere across the Pacific Rim. The atmosphere over China provides a natural testbed for studying the climatic effects of aerosols, which the Intergovernmental Panel on Climate
19, 2007 [Feature Stories and Releases] 19, 2007 [Feature Stories and Releases] Marked Improvements Shown in Global Weather Forecast Model Bookmark and Share Contact: Lynne Roeder, ARM Public Information Officer, 509.372.4331 Example of an ECMWF analysis. Example of an ECMWF analysis. One of the world's foremost weather forecast models is showing dramatic improvements thanks to the pairing of two recent advancements in the representation of radiative transfer in global weather and climate models. Developed with funding from the Atmospheric Radiation Measurement (ARM) Program, the new components simulate the absorption and scattering of sunlight ("solar radiation") in the atmosphere and better represent small-scale cloud variability. Their application to the forecast model of the European Centre for Medium-Range Weather Forecasts (ECMWF) solves a
February 15, 2013 [Feature Stories and Releases] February 15, 2013 [Feature Stories and Releases] A Homecoming Party at the Los Angeles Shipping Dock Bookmark and Share Department of Energy's mobile climate observatory completes its first extended marine operation Early this January, curious workers at the Los Angeles shipping dock watched as engineers using cranes unloaded radars and other equally fragile scientific instruments from a cargo ship, at times without even looking at how they were carrying out the operation. "It is a strange dance," laughs Nicki Hickmon, acknowledging but at the same time brushing aside any concerns one may have regarding impending catastrophes. "Our team works hard to secure everything, and with some luck and skilled contractors, we've avoided instrument mishaps," assures